1、生命定义
@property (nonatomic, strong) MBProgressHUD *progressBox;
 
2、初始化，此为视图居中显示
self.progressBox = [[MBProgressHUD alloc] initWithView:self.view];
[progressBox setYOffset:-50];
[self.view addSubview:progressBox];
 
3、开始旋转，例如你正在请求时
[self.progressBox setLabelText:@"login_loading"];
[self.progressBox show:YES];
 
4、停止旋转
[self.progressBox hide:YES];
//objectc/5847