pieViewController.m文件
@implementation pieViewController
- (void)viewDidLoad {
[super viewDidLoad];
pieview *view=[[pieview alloc]init];
view.radius=50;
view.frame=CGRectMake(4, 150, 150, 300);
[self.view addSubview:view];
//view.backgroundColor=[UIColor clearColor];
//模拟5秒后执行这个段代码
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
view.radius=20;
});
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
效果
5秒之后
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