宽高不可变
//菊花
UIActivityIndicatorView* aiv = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];//整个view的大小，不是菊花的大小
[self.view addSubview:aiv];
//[aiv release];
//类型
[aiv setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];
/*
UIActivityIndicatorViewStyleWhiteLarge, //白 大
UIActivityIndicatorViewStyleWhite, //白
UIActivityIndicatorViewStyleGray //灰
*/
//设置颜色
[aiv setColor:[UIColor redColor]];
//停止的时候是否显示出来
[aiv setHidesWhenStopped:YES];
//开始，停止，是否在动画/停止
[aiv startAnimating];
//[aiv stopAnimating];
//[aiv isAnimating];
