UISearchBar子类实例化 快速创建搜索框

#import <UIKit/UIKit.h>@interface UISearchBar : UITextField+ (instancetype)searchBar;@end#import "MySearchBar.h"@interface MySearchBar()@end@implementation MySearchBar+ (instancetype)searchBar{    return [[self alloc] init];}- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // 背景        self.background = [UIImage resizedImageWithName:@"searchbar_textfield_background"];                // 左边的放大镜图标        UIImageView *iconView = [[UIImageView alloc] initWithImage:[UIImage imageWithName:@"searchbar_textfield_search_icon"]];        iconView.contentMode = UIViewContentModeCenter;        self.leftView = iconView;        self.leftViewMode = UITextFieldViewModeAlways;                // 字体        self.font = [UIFont systemFontOfSize:13];                // 右边的清除按钮        self.clearButtonMode = UITextFieldViewModeAlways;                // 设置提醒文字        NSMutableDictionary *attrs = [NSMutableDictionary dictionary];        attrs[NSForegroundColorAttributeName] = [UIColor grayColor];        self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"搜索" attributes:attrs];                // 设置键盘右下角按钮的样式        self.returnKeyType = UIReturnKeySearch;        self.enablesReturnKeyAutomatically = YES;    }    return self;}- (void)layoutSubviews{    [super layoutSubviews];        // 设置左边图标的frame    self.leftView.frame = CGRectMake(0, 0, 30, self.frame.size.height);}@end

使用：

    MySearchBar *search = [MySearchBar searchBar];    search.frame = CGRectMake(0, 0, 300, 30);        self.navigationItem.titleView = search;

  效果：

链接: http://pan.baidu.com/s/1hqlftli 密码: bwhd