摘要：
//初始化:UIActivityIndicatorView* indicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];//设置显示样式,见UIActivityIndicatorViewStyle的定义indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;//设置显示位置[indicator setCenter:CGPointMake(self.frame.size.width / 阅读全文