Protocol - 5

来源：互联网发布：c语言开平方怎么写编辑：程序博客网时间：2024/04/29 10:39

在放一个关于委托协议传值的规范写法：

协议的定义：

#import <UIKit/UIKit.h>@class KeyBordView;@protocol KeyBordVIewDelegate <NSObject>- (void)beginRecord;- (void)finishRecord;- (void)KeyBordView:(KeyBordView* )keyBoardView textFiledBegin:(UITextField *)textFiled;- (void)KeyBordView:(KeyBordView* )keyBoardView textFiledReturn:(UITextField *)textFiled;@end

定义“委托者” delegate：

@interface KeyBordView : UIView@property (nonatomic, assign) id <KeyBordVIewDelegate> delegate;@end

在KeyBordView实现文件中的对委托方法的传值，这里传的是self，self.textFiled

注意到这里非常规范的先判断委托是否被赋予了（被委托者），具体是用respondsToSelector来判断，非常规范

#pragma mark - UITextField代理方法- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{    if ([self.delegate respondsToSelector:@selector(KeyBordView:textFiledBegin:)])    {        [self.delegate KeyBordView:self textFiledBegin:textField];    }        return YES;}- (BOOL)textFieldShouldReturn:(UITextField *)textField{    if ([self.delegate respondsToSelector:@selector(KeyBordView:textFiledReturn:)])    {        [self.delegate KeyBordView:self textFiledReturn:textField];    }             return YES;}

最后是被委托者实现委托方法！

同理：

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