UI控件笔记（十五）：UI之自定义搜索框的封装

一、SearchBar.h文件

#import <UIKit/UIKit.h>

@protocol SearchBarDelegate <NSObject>//要把当前搜索View里的搜索内容传给VC

-(void)sendTextToVC:(NSString*)text;

@end

@interface SearchBar : UIView<UITextFieldDelegate>

@property(nonatomic,assign)id<SearchBarDelegate>delegate;

@end

二、SearchBar.m文件

#import "SearchBar.h"

#import <QuartzCore/QuartzCore.h>

@implementation SearchBar

-(id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if(self)

    {

        self.backgroundColor = [UIColor colorWithRed:222/255.0 green:222/255.0 blue:222/255.0 alpha:1];

        

        UITextField *searchBar = [[UITextField alloc] initWithFrame:CGRectMake(10,7,300,30)];

        //把一个UI变成圆角的，ios6之前需要添加QuartzCore.framework库

        searchBar.layer.masksToBounds = YES;//当前V上面的子视图不会超了

        searchBar.layer.cornerRadius = 5;

        searchBar.backgroundColor = [UIColor whiteColor];

        searchBar.delegate = self;

        searchBar.placeholder = @"60万款应用搜索看";

        [self addSubview:searchBar];

        [searchBar release];

        searchBar.tag = 5000;

        

        UIButton *cancelBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

        cancelBtn.frame = CGRectMake(self.frame.size.width-70,7,60,30);

        [cancelBtn setTitle:@"cancel" forState:UIControlStateNormal];

        [cancelBtn addTarget:self action:@selector(cancelDown) forControlEvents:UIControlEventTouchUpInside];

        [self addSubview:cancelBtn];

        cancelBtn.tag = 1999;

        cancelBtn.hidden = YES;

    }

    

    returnself;

}

-(void)cancelDown//取消搜索功能

{

    UIButton *cancelBtn = (UIButton*)[self viewWithTag:1999];

    cancelBtn.hidden = YES;

    

    UITextField *textField = (UITextField*)[self viewWithTag:5000];

    [textField resignFirstResponder];

    textField.text = @"";//取消的时候，文本输入框里置空

    [UIView animateWithDuration:2 animations:^{

        textField.frame = CGRectMake(10,7,300,30);

    }];

    

    [self.delegate sendTextToVC:@""];//取消的时候，给vc传一个空字符串，当vc收到空字符串的时候，表示不使用搜索接口，而使用当前VC正常的loadData接口（下拉刷新接口）

}

#pragma mark textfield代理

-(void)textFieldDidBeginEditing:(UITextField *)textField

{

    [UIView animateWithDuration:2 animations:^{

        textField.frame = CGRectMake(10,7,210,30);

    } completion:^(BOOL finished) {

        UIButton *cancelBtn = (UIButton*)[self viewWithTag:1999];

        cancelBtn.hidden = NO;

    }];

}

-(BOOL)textFieldShouldReturn:(UITextField *)textField//搜索

{

    [textField resignFirstResponder];

    

    [self.delegate sendTextToVC:textField.text];//代理传文本字符串

    

    returnYES;

}

@end