1. .h文件。

block 無(wú)傳入?yún)?shù)值，沒(méi)有返回值

#import@interface BaseViewController : UIViewController

-(void)showError:(NSString *)errorMessage block:(void(^)(void))errorBlock;

@end

2. .h文件 。先定義Block，傳入?yún)?shù)問(wèn) NSInteger 類型，無(wú)返回值?

typedef void(^ButtonActionBlock)(NSInteger tag);

@interface XYRToolBar : UIToolbar

@property (nonatomic, copy) ButtonActionBlock buttonActionBlock;

-(void)buttonActionBlock:(ButtonActionBlock)didClickButton;

@end