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//初始化:UIActivityIndicatorView* indicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];//設置顯示樣式,見(jiàn)UIActivityIndicatorViewStyle的定義indicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;//設置顯示位置[indicator setCenter:CGPointMake(self.frame.size.width / 2, self.frame.size.height / 2)];//設置背景色indicator.backgroundColor = UIColor.gray.//設置背景透明indicator.alpha = 0.5;//設置背景為圓角矩形indicator.layer.cornerRadius = 6;indicator.layer.masksToBuounds = YES;//將初始化好的indicator add到view中[view addSubView:indicator];//開(kāi)始顯示Loading動(dòng)畫(huà)[indicator startAnimating];//停止顯示Loading動(dòng)畫(huà)[indicator stopAnimating];