Class: UIView

Inherits:
Object show all
Defined in:
lib/sugarcube-gestures/gestures.rb,
lib/sugarcube-pipes/pipes.rb,
lib/sugarcube-to_s/uiview.rb,
lib/sugarcube-uikit/uiview.rb,
lib/sugarcube-animations/uiview.rb

Overview

BubbleWrap has these same methods, but the logic and options are a little different. In the spirit of open source, I am blatantly copying their code, changing it to suit my needs, and offering it here

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.animate(options = {}, &animations) ⇒ Object

If options is a Numeric, it is used as the duration. Otherwise, duration is an option, and defaults to 0.3. All the transition methods work this way.



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# File 'lib/sugarcube-animations/uiview.rb', line 8

def animate(options={}, &animations)
  raise "animation block is required" unless animations

  if options.is_a? Numeric
    duration = options
    options = {}
  else
    duration = options[:duration] || 0.3
  end

  delay = options[:delay] || 0

  # chain: true is used inside animation_chain blocks to prevent some weird
  # animation errors (nested animations do not delay/queue as you'd expect)
  if options[:chain] || Thread.current[:sugarcube_chaining]
    duration = 0
    delay = 0
    raise "Completion blocks cannot be used within an animation_chain block" if options[:after]
  end

  after_animations = options[:after]
  if after_animations
    if after_animations.arity == 0
      after_adjusted = ->(finished){ after_animations.call }
    else
      after_adjusted = after_animations
    end
  else
    after_adjusted = nil
  end

  animation_options = options[:options]
  unless animation_options
    curve = options.fetch(:curve, UIViewAnimationOptionCurveEaseInOut)
    curve = curve.uianimationcurve if curve.is_a?(Symbol)

    from_current = options.fetch(:from_current, true) ? UIViewAnimationOptionBeginFromCurrentState : 0
    allow_interaction = options.fetch(:allow_interaction, false) ? UIViewAnimationOptionAllowUserInteraction : 0

    animation_options = curve | from_current
  end

  if duration == 0 && delay == 0
    animations.call
    after_adjusted.call(true) if after_adjusted
  else
    prev_value = Thread.current[:sugarcube_chaining]
    Thread.current[:sugarcube_chaining] = true
    UIView.animateWithDuration( duration,
                         delay: delay,
                       options: animation_options,
                    animations: animations,
                    completion: after_adjusted
                              )
    Thread.current[:sugarcube_chaining] = prev_value
  end
  nil
end

.animation_chain(options = {}, &first) ⇒ Object

Animation chains are great for consecutive animation blocks. Each chain can take the same options that UIView##animate take.



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# File 'lib/sugarcube-animations/uiview.rb', line 69

def animation_chain(options={}, &first)
  chain = SugarCube::AnimationChain.new
  if first
    chain.and_then(options, &first)
  end
  return chain
end

.attr_updates(*attrs) ⇒ Object 



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# File 'lib/sugarcube-uikit/uiview.rb', line 10

def attr_updates(*attrs)
  attr_accessor(*attrs)
  attrs.each do |attr|
    define_method("#{attr}=") { |value|
      if instance_variable_get("@#{attr}") != value
        setNeedsDisplay
      end
      instance_variable_set("@#{attr}", value)
    }
  end
end

.first_responder ⇒ Object

returns the first responder, starting at the Window and searching every subview



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# File 'lib/sugarcube-uikit/uiview.rb', line 6

def first_responder
  UIApplication.sharedApplication.keyWindow.first_responder
end

Instance Method Details

#<<(view) ⇒ Object

superview << view => superview.addSubview(view)



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# File 'lib/sugarcube-uikit/uiview.rb', line 26

def <<(view)
  self.addSubview(view)
  return self
end

#animate(options = {}, &animations) ⇒ Object

Same as UIView##animate, but acts on self



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# File 'lib/sugarcube-animations/uiview.rb', line 90

def animate(options={}, &animations)
  if options.is_a? Numeric
    duration = options
    options = {}
  else
    duration = options[:duration] || 0.3
  end

  assign = options[:assign] || {}

  UIView.animate(options) do
    animations.call if animations

    assign.each do |key, value|
      self.send("#{key}=", value)
    end
  end
  self
end

#back_fiend!(options = {}) ⇒ Object

Moves the view backwards, similar to what Google has been doing a lot recently



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# File 'lib/sugarcube-animations/uiview.rb', line 369

def back_fiend!(options={})
  scale = options[:scale] || 0.5
  perspective = options[:perspective] || -0.0005
  size = options[:size] || -140

  UIView.animation_chain(duration:200.millisecs, options:UIViewAnimationOptionCurveLinear) {
    self.layer.transform = CATransform3DTranslate(CATransform3DScale(CATransform3D.new(1,0,0,0, 0,1,0,perspective, 0,0,1,0, 0,0,0,1), scale, scale, scale), 0, size, 0)
  }.and_then(duration:300.millisecs, options:UIViewAnimationOptionCurveLinear) {
    self.layer.transform = CATransform3DTranslate(CATransform3DScale(CATransform3DIdentity, scale, scale, scale), 0, size, 0)
  }.start
end

#controller ⇒ Object

returns the nearest nextResponder instance that is a UIViewController. Goes up the responder chain until the nextResponder is a UIViewController subclass, or returns nil if none is found.



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# File 'lib/sugarcube-uikit/uiview.rb', line 54

def controller
  if nextResponder && nextResponder.is_a?(UIViewController)
    nextResponder
  elsif nextResponder
    nextResponder.controller
  else
    nil
  end
end

#convert_bounds(destination) ⇒ Object

Returns the receiver's bounds in the coordinate system of destination



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# File 'lib/sugarcube-uikit/uiview.rb', line 101

def convert_bounds(destination)
  self.convertRect(self.bounds, toView:destination)
end

#convert_origin(destination) ⇒ Object

Returns the receiver's bounds in the coordinate system of destination



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# File 'lib/sugarcube-uikit/uiview.rb', line 106

def convert_origin(destination)
  self.convertPoint([0, 0], toView:destination)
end

#delta_to(delta, options = {}, &after) ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 179

def delta_to(delta, options={}, &after)
  f = self.frame
  delta = SugarCube::CoreGraphics::Point(delta)
  position = SugarCube::CoreGraphics::Point(f.origin)
  to_position = CGPoint.new(position.x + delta.x, position.y + delta.y)
  move_to(to_position, options, &after)
  self
end

#fade(options = {}, &after) ⇒ Object

Changes the layer opacity.



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# File 'lib/sugarcube-animations/uiview.rb', line 111

def fade(options={}, &after)
  if options.is_a? Numeric
    options = { opacity: options }
  end

  options[:after] = after

  animate(options) do
    self.alpha = options[:opacity]
  end
end

#fade_in(options = {}, &after) ⇒ Object

Changes the layer opacity to 1.

See Also:



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# File 'lib/sugarcube-animations/uiview.rb', line 137

def fade_in(options={}, &after)
  if options.is_a? Numeric
    options = { duration: options }
  end

  options[:opacity] ||= 1.0

  fade(options, &after)
end

#fade_out(options = {}, &after) ⇒ Object

Changes the layer opacity to 0.

See Also:



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# File 'lib/sugarcube-animations/uiview.rb', line 125

def fade_out(options={}, &after)
  if options.is_a? Numeric
    options = { duration: options }
  end

  options[:opacity] ||= 0.0

  fade(options, &after)
end

#fade_out_and_remove(options = {}, &after) ⇒ Object

Changes the layer opacity to 0 and then removes the view from its superview

See Also:



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# File 'lib/sugarcube-animations/uiview.rb', line 149

def fade_out_and_remove(options={}, &after)
  if options.is_a? Numeric
    options = { duration: options }
  end

  original_opacity = self.alpha

  after_remove = proc do
    self.alpha = original_opacity
    removeFromSuperview
    after.call if after
  end

  fade_out(options, &after_remove)
end

#first_responder ⇒ Object

returns the first responder, or nil if it cannot be found



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# File 'lib/sugarcube-uikit/uiview.rb', line 37

def first_responder
  if self.firstResponder?
    return self
  end

  found = nil
  self.subviews.each do |subview|
    found = subview.first_responder
    break if found
  end

  return found
end

#forward_fiend!(options = {}) ⇒ Object

restores the layer after a call to 'back_fiend!'



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# File 'lib/sugarcube-animations/uiview.rb', line 382

def forward_fiend!(options={})
  UIView.animate(options) do
    self.layer.transform = CATransform3DIdentity
  end
end

#hide ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 84

def hide
  self.hidden = true
  self
end

#move_to(position, options = {}, &after) ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 165

def move_to(position, options={}, &after)
  if options.is_a? Numeric
    options = { duration: options }
  end

  options[:after] = after

  animate(options) do
    f = self.frame
    f.origin = SugarCube::CoreGraphics::Point(position)
    self.frame = f
  end
end

#off_gestures ⇒ Object 



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# File 'lib/sugarcube-gestures/gestures.rb', line 33

def off_gestures
  if @sugarcube_recognizers
    @sugarcube_recognizers.each do |recognizer, proc|
      self.removeGestureRecognizer(recognizer)
    end
    @sugarcube_recognizers = nil
  end

  self
end

#on_gesture(recognizer) ⇒ Object #on_gesture(recognizer_class) ⇒ Object

A generic gesture adder, but accepts a block like the other gesture methods

Examples:

Using a UIGestureRecognizer class

view.on_gesture(UISwipeGestureRecognizer, direction: UISwipeGestureRecognizerDirectionLeft) { puts "swiped left" }

Using a UIGestureRecognizer instance

gesture = UISwipeGestureRecognizer
gesture.direction = UISwipeGestureRecognizerDirectionLeft
view.on_gesture(gesture) { puts "swiped left" }

Overloads:

  • #on_gesture(recognizer) ⇒ Object

    Adds the gesture to the view, and yields the block when the gesture is recognized

  • #on_gesture(recognizer_class) ⇒ Object

    Instantiates a gesture and adds it to the view.

Parameters:

  • options (Hash) (defaults to: {}) —

    method/value pairs to call on the gesture.

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 19

def on_gesture(klass, options={}, &proc)
  if klass.is_a? UIGestureRecognizer
    recognizer = klass
    recognizer.addTarget(self, action:'sugarcube_handle_gesture:')
  else
    recognizer = klass.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  end

  options.each do |method, value|
    recognizer.send(method, value)
  end
  sugarcube_add_gesture(proc, recognizer)
end

#on_tap(taps) ⇒ Object #on_tap(options) ⇒ Object

Overloads:

  • #on_tap(taps) ⇒ Object

    Parameters:

    • taps (Fixnum) —

      Number of taps

  • #on_tap(options) ⇒ Object

    Options Hash (options):

    • :min_fingers (Fixnum) —

      Minimum umber of fingers for gesture to be recognized

    • :max_fingers (Fixnum) —

      Maximum number of fingers for gesture to be recognized

    • :fingers (Fixnum) —

      If min_fingers or max_fingers is not assigned, this will be the default.

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 124

def on_pan(fingers_or_options=nil, &proc)
  fingers = nil
  min_fingers = nil
  max_fingers = nil

  if fingers_or_options
    if fingers_or_options.is_a? Hash
      fingers = fingers_or_options[:fingers] || fingers
      min_fingers = fingers_or_options[:min_fingers] || min_fingers
      max_fingers = fingers_or_options[:max_fingers] || max_fingers
    else
      fingers = fingers_or_options
    end
  end

  # if fingers is assigned, but not min/max, assign it as a default
  min_fingers ||= fingers
  max_fingers ||= fingers

  recognizer = UIPanGestureRecognizer.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  recognizer.maximumNumberOfTouches = min_fingers if min_fingers
  recognizer.minimumNumberOfTouches = max_fingers if max_fingers
  sugarcube_add_gesture(proc, recognizer)
end

#on_pinch {|recognizer| ... } ⇒ Object

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 70

def on_pinch(&proc)
  recognizer = UIPinchGestureRecognizer.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  sugarcube_add_gesture(proc, recognizer)
end

#on_press(duration) ⇒ Object #on_tap(options) ⇒ Object

Overloads:

  • #on_press(duration) ⇒ Object

    Parameters:

    • duration (Fixnum) —

      How long in seconds before gesture is recognized

  • #on_tap(options) ⇒ Object

    Options Hash (options):

    • :duration (Fixnum) —

      How long in seconds before gesture is recognized

    • :taps (Fixnum) —

      Number of taps before gesture is recognized

    • :fingers (Fixnum) —

      Number of fingers before gesture is recognized

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 156

def on_press(duration_or_options=nil, &proc)
  duration = nil
  taps = nil
  fingers = nil

  if duration_or_options
    if duration_or_options.is_a? Hash
      duration = duration_or_options[:duration] || duration
      taps = duration_or_options[:taps] || taps
      fingers = duration_or_options[:fingers] || fingers
    else
      duration = duration_or_options
    end
  end

  recognizer = UILongPressGestureRecognizer.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  recognizer.minimumPressDuration = duration if duration
  recognizer.numberOfTapsRequired = taps if taps
  recognizer.numberOfTouchesRequired = fingers if fingers
  sugarcube_add_gesture(proc, recognizer)
end

#on_rotate {|recognizer| ... } ⇒ Object

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 76

def on_rotate(&proc)
  recognizer = UIRotationGestureRecognizer.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  sugarcube_add_gesture(proc, recognizer)
end

#on_swipe(taps) ⇒ Object #on_swipe(options) ⇒ Object

Overloads:

  • #on_swipe(taps) ⇒ Object

    Parameters:

    • direction (Fixnum) —

      Direction of swipe

  • #on_swipe(options) ⇒ Object

    Options Hash (options):

    • :fingers (Fixnum) —

      Number of fingers before gesture is recognized

    • :direction (Fixnum, Symbol) —

      Direction of swipe, as a UISwipeGestureRecognizerDirection constant or a symbol (:left, :right, :up, :down)

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 87

def on_swipe(direction_or_options, &proc)
  direction = nil
  fingers = nil

  if direction_or_options
    if direction_or_options.is_a? Hash
      direction = direction_or_options[:direction] || direction
      fingers = direction_or_options[:fingers] || fingers
    else
      direction = direction_or_options
    end
  end

  case direction
  when :left
    direction = UISwipeGestureRecognizerDirectionLeft
  when :right
    direction = UISwipeGestureRecognizerDirectionRight
  when :up
    direction = UISwipeGestureRecognizerDirectionUp
  when :down
    direction = UISwipeGestureRecognizerDirectionDown
  end

  recognizer = UISwipeGestureRecognizer.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  recognizer.direction = direction if direction
  recognizer.numberOfTouchesRequired = fingers if fingers
  sugarcube_add_gesture(proc, recognizer)
end

#on_tap(taps) ⇒ Object #on_tap(options) ⇒ Object

Overloads:

  • #on_tap(taps) ⇒ Object

    Parameters:

    • taps (Fixnum) —

      Number of taps

  • #on_tap(options) ⇒ Object

    Options Hash (options):

    • :taps (Fixnum) —

      Number of taps before gesture is recognized

    • :fingers (Fixnum) —

      Number of fingers before gesture is recognized

Yields:

  • (recognizer) —

    Handles the gesture event, and passes the recognizer instance to the block.



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# File 'lib/sugarcube-gestures/gestures.rb', line 50

def on_tap(taps_or_options=nil, &proc)
  taps = nil
  fingers = nil

  if taps_or_options
    if taps_or_options.is_a? Hash
      taps = taps_or_options[:taps] || taps
      fingers = taps_or_options[:fingers] || fingers
    else
      taps = taps_or_options
    end
  end

  recognizer = UITapGestureRecognizer.alloc.initWithTarget(self, action:'sugarcube_handle_gesture:')
  recognizer.numberOfTapsRequired = taps if taps
  recognizer.numberOfTouchesRequired = fingers if fingers
  sugarcube_add_gesture(proc, recognizer)
end

#reframe_to(frame, options = {}, &after) ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 202

def reframe_to(frame, options={}, &after)
  if options.is_a? Numeric
    options = { duration: options }
  end

  options[:after] = after

  animate(options) do
    self.frame = frame
  end
end

#resize_to(size, options = {}, &after) ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 188

def resize_to(size, options={}, &after)
  if options.is_a? Numeric
    options = { duration: options }
  end

  options[:after] = after

  animate(options) do
    f = self.frame
    f.size = SugarCube::CoreGraphics::Size(size)
    self.frame = f
  end
end

#rotate(options = {}, more_options = {}, &after) ⇒ Object

Changes the current rotation by new_angle (rotate rotates to a specific angle)



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# File 'lib/sugarcube-animations/uiview.rb', line 233

def rotate(options={}, more_options={}, &after)
  if options.is_a? Numeric
    new_angle = options
    options = more_options
  else
    new_angle = options[:angle]
  end

  old_angle = valueForKeyPath('layer.transform.rotation.z')
  options[:angle] = old_angle + new_angle
  rotate_to(options, &after)
end

#rotate_to(options = {}, more_options = {}, &after) ⇒ Object

Changes the current rotation to new_angle (rotate rotates relative to the current rotation)



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# File 'lib/sugarcube-animations/uiview.rb', line 216

def rotate_to(options={}, more_options={}, &after)
  if options.is_a? Numeric
    new_angle = options
    options = more_options
  else
    new_angle = options[:angle]
  end

  options[:after] = after

  animate(options) do
    self.transform = CGAffineTransformMakeRotation(new_angle)
  end
end

#shake(options = {}) ⇒ Object

Vibrates the target. You can trick this thing out to do other effects, like:

Examples:

# wiggle
view.shake(offset: 0.1, repeat: 2, duration: 0.5, keypath: 'transform.rotation')
# slow nodding
view.shake(offset: 20, repeat: 10, duration: 5, keypath: 'transform.translation.y')


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# File 'lib/sugarcube-animations/uiview.rb', line 279

def shake(options={})
  if options.is_a? Numeric
    duration = options
    options = {}
  else
    duration = options[:duration] || 0.3
  end

  offset = options[:offset] || 8
  repeat = options[:repeat] || 3
  if repeat == Float::INFINITY
    duration = 0.1
  else
    duration /= repeat
  end
  keypath = options[:keypath] || 'transform.translation.x'
  if keypath == 'transform.rotation'
    value_keypath = 'layer.transform.rotation.z'
  else
    value_keypath = keypath
  end

  if options[:from_current]
    origin = options[:origin] || valueForKeyPath(value_keypath)
  else
    origin = options[:origin] || 0
  end
  left = origin - offset
  right = origin + offset

  animation = CAKeyframeAnimation.animationWithKeyPath(keypath)
  animation.send(:'setDuration:', duration)
  animation.repeatCount = repeat
  animation.values = [origin, left, right, origin]
  animation.keyTimes = [0, 0.25, 0.75, 1.0]
  self.layer.addAnimation(animation, forKey:'shake')
  self
end

#show ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 79

def show
  self.hidden = false
  self
end

#slide(direction, options = {}, more_options = {}, &after) ⇒ Object 



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# File 'lib/sugarcube-animations/uiview.rb', line 246

def slide(direction, options={}, more_options={}, &after)
  if options.is_a? Numeric
    size = options
    options = more_options
  else
    size = options[:size]
  end

  case direction
  when :left
    size ||= self.bounds.size.width
    delta_to([-size, 0], options, &after)
  when :right
    size ||= self.bounds.size.width
    delta_to([size, 0], options, &after)
  when :up
    size ||= self.bounds.size.height
    delta_to([0, -size], options, &after)
  when :down
    size ||= self.bounds.size.height
    delta_to([0, size], options, &after)
  else
    raise "Unknown direction #{direction.inspect}"
  end
  self
end

#to_s(options = {}) ⇒ Object 



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# File 'lib/sugarcube-to_s/uiview.rb', line 3

def to_s(options={})
  options[:superview] = true if options[:superview].nil?
  if self.respond_to? :stylename and self.stylename
    suffix = ' stylename: ' + self.stylename.inspect
  else
    suffix = ''
  end
  if options[:inner].is_a? Hash
    inner = ''
    options[:inner].each do |key, value|
      inner += ', ' if inner.length > 0
      inner += "#{key}: #{value.inspect}"
    end
  else
    inner = options[:inner]
  end

  "#{self.class.name}(##{self.object_id.to_s(16)}, #{SugarCube::Adjust::format_frame(self.frame)}" +
                      (inner ? ', ' + inner : '') +
                      ')' +
                      (options[:superview] && self.superview ? ", child of #{self.superview.class.name}(##{self.superview.object_id.to_s(16)})" : '') +
                      suffix
end

#tumble(options = {}, &after) ⇒ Object

Moves the view off screen while slowly rotating it.

Based on https://github.com/warrenm/AHAlertView/blob/master/AHAlertView/AHAlertView.m



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# File 'lib/sugarcube-animations/uiview.rb', line 327

def tumble(options={}, &after)
  if options.is_a? Numeric
    default_duration = options
    options = {}
  else
    default_duration = 0.3
  end

  options[:duration] ||= default_duration
  options[:options] ||= UIViewAnimationOptionCurveEaseIn|UIViewAnimationOptionBeginFromCurrentState
  reset_transform = self.transform
  reset_after = ->(finished) do
    self.transform = reset_transform
  end

  if after
    options[:after] = ->(finished) do
      reset_after.call(finished)

      if after.arity == 0
        after.call
      else
        after.call(finished)
      end
    end
  else
    options[:after] = reset_after
  end

  self.animate(options) do
    window = UIApplication.sharedApplication.windows[0]
    top = self.convertPoint([0, 0], toView:nil).y
    height = window.frame.size.height - top
    offset = CGPoint.new(0, height * 1.5)
    offset = CGPointApplyAffineTransform(offset, self.transform)
    self.transform = CGAffineTransformConcat(self.transform, CGAffineTransformMakeRotation(-Math::PI/4))
    self.center = CGPointMake(self.center.x + offset.x, self.center.y + offset.y)
  end
end

#uiimage(use_content_size = false) ⇒ Object

Easily take a snapshot of a UIView.

Calling uiimage with no arguments will return the image based on the bounds of the image. In the case of container views (notably UIScrollView and its children) this does not include the entire contents, which is something you probably want.

If you pass a truthy value to this method, it will use the contentSize of the view instead of the bounds, and it will draw all the child views, not just those that are visible in the viewport.

It is guaranteed that true and :all will always have this behavior. In the future, if this argument becomes something that accepts multiple values, those two are sacred.



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# File 'lib/sugarcube-uikit/uiview.rb', line 78

def uiimage(use_content_size=false)
  scale = UIScreen.mainScreen.scale
  if use_content_size
    UIGraphicsBeginImageContextWithOptions(contentSize, false, scale)
    context = UIGraphicsGetCurrentContext()
    subviews.each do |subview|
      CGContextSaveGState(context)
      CGContextTranslateCTM(context, subview.frame.origin.x, subview.frame.origin.y)
      subview.layer.renderInContext(context)
      CGContextRestoreGState(context)
    end
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
  else
    UIGraphicsBeginImageContextWithOptions(bounds.size, false, scale)
    layer.renderInContext(UIGraphicsGetCurrentContext())
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
  end
  return image
end

#unshift(view) ⇒ Object 



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# File 'lib/sugarcube-uikit/uiview.rb', line 31

def unshift(view)
  self.insertSubview(view, atIndex:0)
  return self
end

#|(filter) ⇒ Object

Applies a filter (to a UIImage representation) or coerces to another format



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# File 'lib/sugarcube-pipes/pipes.rb', line 35

def |(filter)
 if filter == UIImage
   self.uiimage
 else
   raise "The `|` operator is not supported for the #{filter.is_a?(Class) ? filter.name : filter.class.name} class"
 end
end