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CALayer简介
1、CALayer一般作为UIView的容器而使用
2、CALayer是一个管理着图片载体(image-based content)的层结构
3、直接修改单独创建出的CALayer的属性可以出发隐式动画
4、UIView中的CALayer动画必须显示出发才能生效
CALayer实现自定义进度条
- (void)viewDidLoad { [super viewDidLoad];
UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 3)]; containerView.backgroundColor = [UIColor redColor];
[self.view addSubview:containerView];
//修改该容器layer的相关值 // containerView.layer.frame = CGRectMake(0, 0, 200, 200); // containerView.layer.backgroundColor = [UIColor greenColor].CGColor;
//创建一个独立的layer self.layer = [CALayer layer]; //刚开始的进度为0 self.layer.frame = CGRectMake(0, 0, 20, 3); self.layer.backgroundColor = [UIColor greenColor].CGColor;
[containerView.layer addSublayer:self.layer];
[self performSelector:@selector(layerAnimation) withObject:nil afterDelay:3.0];
} - (void)layerAnimation { NSLog(@"修改了layer的frame值"); //执行了隐式动画 self.layer.frame = CGRectMake(0, 0, 100, 3); self.layer.backgroundColor = [UIColor blackColor].CGColor; } |
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原文地址:http://my.oschina.net/hejunbinlan/blog/469519