CALayer的隐式动画
2016-01-06 22:02
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何为隐式动画
隐式动画就是直接改变layer的一些属性时,并没有作动画处理,layer会附带有动画效果,而不是直接瞬间变化,这个动画时间默认是0.25秒。layer的哪些属性有隐式动画
区分属性是不是具有隐式动画,要看属性定义有没有“Animatable”字样。比如/* The background color of the layer. Default value is nil. Colors * created from tiled patterns are supported. Animatable. */ @property(nullable) CGColorRef backgroundColor;
backgroundColor属性的定义最后标明了Animatable,说明修改它的值会有默认动画效果。
怎样修改隐式动画
一、通过CATransaction在页面上放了一个layer,通过点击button修改它的颜色
@property (nonatomic,strong) UIView *backView; @property (nonatomic,strong) CALayer *colorLayer; @property (nonatomic,strong) UIButton *changeButton; - (void)viewDidLoad { [super viewDidLoad]; CGFloat kScreenWidth = [UIScreen mainScreen].bounds.size.width; _backView = [[UIView alloc] initWithFrame:CGRectMake(kScreenWidth/2-100, 50, 200, 200)]; _backView.backgroundColor = [UIColor whiteColor]; [self.view addSubview:_backView]; _colorLayer = [CALayer layer]; _colorLayer.frame = CGRectMake(50, 50, 100, 100); _colorLayer.backgroundColor = [UIColor redColor].CGColor; _colorLayer.borderWidth = 0.5; _colorLayer.borderColor = [UIColor blackColor].CGColor; _colorLayer.delegate = self; [_backView.layer addSublayer:_colorLayer]; _changeButton = [UIButton buttonWithType:UIButtonTypeCustom]; [_changeButton addTarget:self action:@selector(changeColor) forControlEvents:UIControlEventTouchUpInside]; _changeButton.frame = CGRectMake(50, 160, 100, 20); [_changeButton setTitle:@"Change Color" forState:UIControlStateNormal]; [_changeButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; _changeButton.titleLabel.font = [UIFont systemFontOfSize:10]; _changeButton.titleLabel.textColor = [UIColor blackColor]; _changeButton.layer.cornerRadius = 5; _changeButton.layer.borderWidth = 0.5; _changeButton.layer.borderColor = [UIColor blackColor].CGColor; _changeButton.backgroundColor = [UIColor whiteColor]; [_backView addSubview:_changeButton]; } - (void)changeColor{ _colorLayer.backgroundColor = [UIColor blueColor].CGColor;] }
为了修改隐式动画,我们对changeColor作修改
- (void)changeColor{ [CATransaction begin]; [CATransaction setAnimationDuration:2]; _colorLayer.backgroundColor = [UIColor blueColor].CGColor; [CATransaction commit]; }
这样点击改变颜色的隐式动画的时间就被修改为2秒。
CATransaction还提供了禁用隐式动画和设置完成动作等方法。
二、通过layer的actions属性
CATransition *transition = [CATransition animation]; transition.type = @"push"; transition.subtype = @"fromLeft"; _colorLayer.actions = @{@"backgroundColor":transition};
这样在改变颜色的过程中就会附带推进的动画效果。
三、通过手动实现-actionForLayer:(CALayer )layer forKey:(NSString )event方法
_colorLayer.delegate = self; - (nullable id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event{ CABasicAnimation *animation = [CABasicAnimation animation]; animation.keyPath = @"backgroundColor"; animation.toValue = (__bridge id)[UIColor blueColor].CGColor; return animation; }
UIView中的layer是没有隐式动画的
UIView关联的layer的隐式动画是被禁用的,所以如果想要通过改变view.layer的属性来实现动画是行不通的,只能通过UIView动画方法或者显式的添加动画来实现。相关文章推荐
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