UIActivityIndicatorView控件

用处： 菊花图

仅有两个方法：[aiv startAnimating]

　　　　　　　[aiv stopAnimating]

-(void)viewDidLoad

{

　　[super viewDidLoad];

　　self.aiv = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

　　self.aiv.frame = CGRectMake(20,20,100,100);

　　[self.view addSubView:self.aiv];

　　

　　self.startBtn = [[UIButton alloc]buttonWithType:UIButtonTypeRoundedRect];

　　self.startBtn.frame = CGRectMake(20,100,100,50);

　　[self.startBtn setTitle:@"start" forState:UIControlStateNormal];

　　[self addTarget:self action:@selector(start:) forControlEvents:UIControlEventTouchUpInside];

　　[self.view addSubView:self.startBtn];

 

}

-(IBAction)start:(id)sender

{

　　//UIButton* btn = (UIButton*)sender;

　　[self.aiv startAnimation];

}