【iOS】风火轮 UIActivityIndicatorView

//创建
UIActivityIndicatorView * indicatorView = [[UIActivityIndicatorView alloc]init];

indicatorView.frame = CGRectMake(200, 100, 100, 100);

//设置样式：
indicatorView.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;

//开始动画
[indicatorView startAnimating];