代理传递方法的作用

.h
#import <UIKit/UIKit.h>@class YJPSearchBar_View;@protocol YJPSearchBarDelegate <NSObject>@optional-(BOOL)searchBarShouldBeginEditing:(YJPSearchBar_View *)searchBar;-(void)searchBarTextDidBeginEditing:(YJPSearchBar_View *)searchBar;-(BOOL)searchBarShouldEndEditing:(YJPSearchBar_View *)searchBar; -(void)searchBarTextDidEndEditing:(YJPSearchBar_View *)searchBar;-(void)searchBar:(YJPSearchBar_View *)searchBar textDidChange:(NSString *)searchText;-(void)searchBarSearchButtonClicked:(YJPSearchBar_View *)searchBar;//确定按钮-(void)searchBarCancelButtonClicked:(YJPSearchBar_View *)searchBar;@end/*************************************************************************/@interface YJPSearchBar_View : UIView//文本的颜色@property (nonatomic,strong) UIColor *textColor;//字体@property (nonatomic,strong) UIFont *searchBarFont;//内容@property (nonatomic,strong) NSString *text;//背景颜色@property (nonatomic,strong) UIColor *searchBarColor;//默认文本@property (nonatomic,strong) NSString *placeHolder;//默认文本的颜色@property (nonatomic,strong) UIColor *placeHoldersColor;//默认文本字体大小@property (nonatomic,strong) UIFont *placeHolderFont;//是否弹出键盘@property (nonatomic,assign) BOOL isBecomeFirstResponder;//设置右边按钮的样式@property (nonatomic,strong) UIImage *deleteImage;//设置代理@property (nonatomic,weak) id<YJPSearchBarDelegate>delegate;
.m
#import "YJPSearchBar_View.h"@interface YJPSearchBar_View ()<UITextFieldDelegate>@property (nonatomic,strong) UITextField *textField;@property (nonatomic,strong) UIImageView *leftView;@property (nonatomic,strong) UIButton *deleteBtn;@end@implementation YJPSearchBar_View-(instancetype)initWithFrame:(CGRect)frame{self = [super initWithFrame:frame];if (self) {    [self initAllViews];}return self;}-(void)initAllViews{self.layer.cornerRadius = self.frame.size.height / 2;self.layer.masksToBounds = YES;    if (_leftView == nil) {    _leftView = [[UIImageView alloc] initWithFrame:CGRectMake(10, (self.frame.size.height - 17) / 2.0f, 17, 17)];    _leftView.image = [UIImage imageNamed:@"leftViewPhoto.jpg"];    [self addSubview:_leftView];    }    if (_textField == nil) {    _textField = [[UITextField alloc] initWithFrame:CGRectMake(_leftView.frame.size.width +     _leftView.frame.origin.x + 10, 2, self.frame.size.width - (_leftView.frame.size.width + _leftView.frame.origin.x + 10) - (self.frame.size.height - 4), self.frame.size.height - 4)];    _textField.backgroundColor = [UIColor yellowColor];    _textField.returnKeyType = UIReturnKeyDone;    _textField.delegate = self;    [_textField addTarget:self action:@selector(textFieldValueChange:) forControlEvents:UIControlEventEditingChanged];    [self addSubview:_textField];    }    if (_deleteBtn == nil) {    _deleteBtn = [UIButton buttonWithType:UIButtonTypeCustom];    _deleteBtn.frame = CGRectMake(self.frame.size.width - self.frame.size.height - 4, 2, self.frame.size.height - 4, self.frame.size.height - 4);    [_deleteBtn setImage:[UIImage imageNamed:@"deleteBtnPhoto.jpg"] forState:UIControlStateNormal];    [_deleteBtn addTarget:self action:@selector(deleteClick:) forControlEvents:UIControlEventTouchUpInside];    [self addSubview:_deleteBtn];    }}
相关代理（Custom）
-(void)setIsBecomeFirstResponder:(BOOL)isBecomeFirstResponder{_isBecomeFirstResponder = isBecomeFirstResponder;if (_isBecomeFirstResponder) {    [_textField becomeFirstResponder];    }}
-(void)setSearchBarColor:(UIColor *)searchBarColor{_searchBarColor = searchBarColor;self.backgroundColor = _searchBarColor;_textField.backgroundColor = _searchBarColor;_leftView.backgroundColor  = _searchBarColor;_deleteBtn.backgroundColor = _searchBarColor;}
-(void)setSearchBarFont:(UIFont *)searchBarFont{_searchBarFont = searchBarFont;_textField.font = _searchBarFont;}
-(void)setTextColor:(UIColor *)textColor{_textColor = textColor;_textField.textColor = textColor;}
-(void)setPlaceHolder:(NSString *)placeHolder{_placeHolder = placeHolder;_textField.placeholder = _placeHolder;}
-(void)setPlaceHoldersColor:(UIColor *)placeHoldersColor{_placeHoldersColor = placeHoldersColor;[_textField setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];}
-(void)setPlaceHolderFont:(UIFont *)placeHolderFont{_placeHolderFont = placeHolderFont;[_textField setValue:_placeHolderFont forKeyPath:@"_placeholderLabel.font"];}
-(void)setText:(NSString *)text{_text = text;_textField.text = _text;}
-(void)setDeleteImage:(UIImage *)deleteImage{_deleteImage = deleteImage;[_deleteBtn setImage:_deleteImage forState:UIControlStateNormal];}
#pragma mark - - deleteClick-(void)deleteClick:(UIButton *)delete{/** *  删除 */if (_delegate && [_delegate respondsToSelector:@selector(searchBarCancelButtonClicked:)]) {    [self.delegate searchBarCancelButtonClicked:self];    }}
#pragma mark - - textFieldValueChange-(void)textFieldValueChange:(UITextField *)textField{if (_delegate && [_delegate respondsToSelector:@selector(searchBar:textDidChange:)]) {    [self.delegate searchBar:self textDidChange:textField.text];    }}
#pragma mark - - UITextFieldDelegate-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{if (_delegate && [_delegate respondsToSelector:@selector(searchBarShouldBeginEditing:)]) {    [self.delegate searchBarShouldBeginEditing:self];    }return YES;}
-(void)textFieldDidBeginEditing:(UITextField *)textField{if (_delegate && [_delegate respondsToSelector:@selector(searchBarTextDidBeginEditing:)]) {    [self.delegate searchBarTextDidBeginEditing:self];    }}
-(BOOL)textFieldShouldEndEditing:(UITextField *)textField{if (_delegate && [_delegate respondsToSelector:@selector(searchBarTextDidEndEditing:)]) {    [self.delegate searchBarShouldEndEditing:self];    }return YES;}
-(void)textFieldDidEndEditing:(UITextField *)textField{if (_delegate && [_delegate respondsToSelector:@selector(searchBarTextDidEndEditing:)]) {    [self.delegate searchBarTextDidEndEditing:self];    }}
-(BOOL)textFieldShouldReturn:(UITextField *)textField{if (_delegate && [_delegate respondsToSelector:@selector(searchBarSearchButtonClicked:)]) {    [self.delegate searchBarSearchButtonClicked:self];    }return YES;}
/*       ＊＊＊＊＊＊ ［在ViewController_ViewDidLoad中调用：］ ＊＊＊＊＊＊＊ YJPSearchBar_View *searchBar = [[YJPSearchBar_View alloc] initWithFrame:CGRectMake(20, 80,     self.view.frame.size.width - 40, 40)]; searchBar.placeHolder = @"搜索"; searchBar.searchBarColor = [UIColor colorWithRed:205 / 255.0  green:235 / 255.0 blue:206 / 255.0 alpha:1.0f]; searchBar.textColor = [UIColor whiteColor]; searchBar.searchBarFont = [UIFont systemFontOfSize:15.0]; searchBar.placeHoldersColor = [UIColor colorWithRed:255 / 255.0 green:255 / 255.0 blue:255 / 255.0 alpha:1.0f]; searchBar.placeHolderFont = [UIFont systemFontOfSize:15.0f]; searchBar.delegate = self; [self.view addSubview:searchBar]; */
@end


作者：Jesonr
链接：http://www.jianshu.com/p/0eaeae75ffe3
來源：简书
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