IOS-CALayer & amp; CAAnimation, ioscalayer plotting

IOS-CALayer & CAAnimation, ioscalayer plotting

1. CALayer

1. CALayer

CALayer belongs to the QuartzCore. framework. We do not need to manually import this library from Xcode5.

CALayer is a layer. When the UIView we draw can be displayed on the screen, the essence is this layer.

The following code describes the basic usage of CALayer.

    CALayer *caLayer = [CALayer layer];    caLayer.backgroundColor = [UIColor cyanColor].CGColor;    caLayer.frame = CGRectMake(10, 20, 100, 100);    caLayer.cornerRadius = 20;
    caLayer.masksToBounds = YES;    [self.view.layer addSublayer:caLayer];

When we execute the above Code, a layer will be added to the view. Shows the effect.

The size of the cornerRadius value determines the layer shape. The length of the cornerRadius is used as a semi-circle in the four corners. You can also set the border, border color, and other information.

    CALayer *caLayer1 = [CALayer layer];    caLayer1.frame = CGRectMake(10, 20, 200, 200);    caLayer1.contents = (id)[UIImage imageNamed:@"health.jpg"].CGImage;    caLayer1.cornerRadius = 100;    caLayer1.masksToBounds = YES;    caLayer1.borderWidth = 10;    caLayer1.borderColor = [UIColor greenColor].CGColor;    [self.view.layer addSublayer:caLayer1];

The effect is as follows: CALayer also has an important attribute position (0.5, 0.5 by default), and caLayer. anchorPoint (0-1)

We can understand:

CALayer * caLayer = [CALayer layer]; caLayer. backgroundColor = [UIColor cyanColor]. CGColor; caLayer. cornerRadius = 20; caLayer. bounds = CGRectMake (200, 20,200,200); caLayer. position = CGPointMake (100,100); caLayer. anchorPoint = CGPointMake (0.5, 0); caLayer. masksToBounds = YES; [self. view. layer addSublayer: caLayer];

Effect:

2. CATextLayer

CATextLayer is a subclass of CALayer. We can write text on it and set the font and other information.

    CATextLayer *caTextlayer = [CATextLayer layer];    caTextlayer.frame = CGRectMake(10, 20, 300, 100);    caTextlayer.string = @"Roy says hello";    caTextlayer.foregroundColor = [UIColor orangeColor].CGColor;    [self.view.layer addSublayer:caTextlayer];

3. CAGradientLayer

This class also inherits CALayer. You can achieve color gradient.

    CAGradientLayer *dLayer = [CAGradientLayer layer];    dLayer.colors = @[(id)[UIColor yellowColor].CGColor,(id)[UIColor grayColor].CGColor,(id)[UIColor redColor].CGColor,(id)[UIColor greenColor].CGColor];    dLayer.startPoint = CGPointMake(0, 0);    dLayer.endPoint = CGPointMake(1, 1);    dLayer.locations = @[@0.0,@0.2,@0.5,@01];//0-1    dLayer.frame = CGRectMake(10, 20, 320, 100);    [self.view.layer addSublayer:dLayer];

Ii. CAAnimation

For CAAnimation, you can understand the following figure and the following code. # Import "ViewController. h "@ interface ViewController () {CALayer * layer;} @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. layer = [CALayer layer]; layer. frame = CGRectMake (10, 20, 60, 60); layer. backgroundColor = [UIColor grayColor]. CGColor; [self. view. layer addSublayer: layer]; UIButton * button = [UIButton buttonWithType: UIButtonTypeCustom]; button. frame = CGRectMake (10, 20,100, 30); button. backgroundColor = [UIColor purpleColor]; [button addTarget: self action: @ selector (btnClick) forControlEvents: UIControlEventTouchUpInside]; [self. view addSubview: button]; // [self basicAnimation]; // [self keyframeAnimation]; // [self groupAnimation];}-(void) btnClick {// transition animation, you can only execute [self transitionAnimation];} // basic animation in the click event to inherit the property animation-(void) basicAnimation {/* // CABasicAnimation * animation = [CABasicAnimation animation]; // The key-path describing the property to be animated animation. keyPath = @ "backgroundColor"; // animation cycle animation. duration = 2; // The attribute from which the animation starts. fromValue = (id) [UIColor grayColor]. CGColor; // to which attribute ends the animation. toValue = (id) [UIColor greenColor]. CGColor; [layer addAnimation: animation forKey: nil]; * // move CABasicAnimation * animation = [CABasicAnimation animation]; animation. keyPath = @ "position"; animation. fromValue = [NSValue valueWithCGPoint: CGPointMake (10, 20)]; animation. toValue = [NSValue valueWithCGPoint: CGPointMake (100,200)]; animation. duration = 3; [layer addAnimation: animation forKey: nil];} // Frame animation, inheriting attribute animation-(void) keyframeAnimation {/* CAKeyframeAnimation * animation = [CAKeyframeAnimation]; // animation attributes. keyPath = @ "backgroundColor"; // animation transition value animation. values = @ [(id) [UIColor redColor]. CGColor, (id) [UIColor greenColor]. CGColor, (id) [UIColor purpleColor]. CGColor]; // animation transition time animation. keyTimes = @ [@ 0.0, @ 0.5, @ 1]; animation. duration = 2; [layer addAnimation: animation forKey: nil]; */CAKeyframeAnimation * animation = [CAKeyframeAnimation animation]; animation. keyPath = @ "position"; animation. values = @ [[NSValue usage: CGPointMake (10, 20)], [NSValue valueWithCGPoint: CGPointMake (10,300)], [NSValue valueWithCGPoint: CGPointMake (200,300)], [NSValue usage: CGPointMake (10,300)], [NSValue valueWithCGPoint: CGPointMake (10, 20)], [NSValue valueWithCGPoint: CGPointMake (50, 50)]; animation. autoreverses = YES; animation. duration = 2; [layer addAnimation: animation forKey: nil];} // Group animation, composite animation, multiple animations are executed simultaneously-(void) groupAnimation {// move CABasicAnimation * basic = [CABasicAnimation animation]; basic. keyPath = @ "position"; basic. duration = 2; basic. autoreverses = YES; basic. fromValue = [NSValue valueWithCGPoint: layer. position]; basic. byValue = [NSValue valueWithCGPoint: CGPointMake (20, 0)]; // color change CAKeyframeAnimation * keyframe = [CAKeyframeAnimation animation]; keyframe. keyPath = @ "backgroundColor"; keyframe. values = @ [(id) [UIColor redColor]. CGColor, (id) [UIColor yellowColor]. CGColor, (id) [UIColor greenColor]. CGColor]; keyframe. duration = 2; keyframe. autoreverses = YES; CAAnimationGroup * group = [CAAnimationGroup animation]; group. animations = @ [basic, keyframe]; // The time here is a group based on the group time. duration = 4; [layer addAnimation: group forKey: nil];} // transition animation-(void) transitionAnimation {CATransition * animation = [CATransition animation]; animation. type = @ "pageUnCurl"; animation. delegate = self; animation. duration = 2; animation. autoreverses = YES; [layer addAnimation: animation forKey: nil];}-(void) didReceiveMemoryWarning {[super didreceivemorywarning]; // Dispose of any resources that can be recreated .} @ endAnimation

For the over-animation type, we can use the following effects.

Cube


 SuckEffect triangle

RippleEffect

PageCurl pagination

PageUnCurl

CameraIrisHollowOpen lens shutter opening

CameraIrisHollowClose lens shutter open