定义block

MJSettingItem.htypedef void (^MJSettingItemOption)();@interface MJSettingItem : NSObject@property (nonatomic, copy) MJSettingItemOption option;@end

   MJSettingItem *update = [MJSettingArrowItem itemWithIcon:@"MoreUpdate" title:@"检查新版本"];    update.option = ^{        // 弹框提示        [MBProgressHUD showMessage:@"正在拼命检查中....."];  };

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typedef void(^myBlock)();@interface PANTableViewController ()@property (nonatomic,copy) myBlock block;@end

- (void)viewDidLoad {    [super viewDidLoad];    self.block = ^{        NSLog(@"加载block");    };}

在需要的地方：self.block();