新項目要做城市選擇，效果圖出來，用系統的搜索框達不到效果圖的效果，設置searchBarStyle屬性時，UISearchBarStyleDefault時設置barTintColor後邊框會有黑線，設置UISearchBarStyleMinimal時無黑線單文本框顏色不符合要求。所以就自定義了下。先看下效果圖

上面兩個效果圖的區別就是下面的圖有個城市和圖片。所以就封裝到一個類中。只是TextField的LeftView變化。還有個問題就是城市名長短不一，設置城市的時候要進行重繪，所以我在set城市名的時候調用重繪方法。具體代碼如下:

//
//  SearchTextField.h
//  LocationDemo
//
//  Created by City--Online on 15/11/30.
//  Copyright © 2015年 City--Online. All rights reserved.
//

#import <UIKit/UIKit.h>

typedef  void(^LeftBtnClickBlock)();

@interface SearchTextField : UITextField

@property (nonatomic,strong) NSString *leftTitle;

@property (nonatomic,copy)   LeftBtnClickBlock btnClickBlock;

-(instancetype)initNoLeftTitleWithFrame:(CGRect)frame;
@end

//
//  SearchTextField.m
//  LocationDemo
//
//  Created by City--Online on 15/11/30.
//  Copyright © 2015年 City--Online. All rights reserved.
//

#import "SearchTextField.h"
#import "Global.h"

@interface SearchTextField ()

@property (nonatomic,strong) UIButton *leftBtn;

@property (nonatomic,strong) UIImageView *leftImgView;

@property (nonatomic,strong) UIImageView *searchImgView;

@property (nonatomic,assign) BOOL isNoLeftTitle;
@end

@implementation SearchTextField
-(instancetype)initNoLeftTitleWithFrame:(CGRect)frame
{
    _isNoLeftTitle=YES;
    return [self initWithFrame:frame];
}
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        
        self.layer.cornerRadius=5;
        self.layer.borderWidth=0.5;
        self.layer.borderColor=XQBColorLineLight.CGColor;
        self.leftViewMode=UITextFieldViewModeAlways;
        self.clearButtonMode=UITextFieldViewModeWhileEditing;
        self.backgroundColor=[UIColor whiteColor];
        
        self.leftView=[[UIView alloc]init];
        
        _leftBtn =[UIButton buttonWithType:UIButtonTypeSystem];
        [_leftBtn addTarget:self action:@selector(btnClickHandle:) forControlEvents:UIControlEventTouchUpInside];
        [_leftBtn setTitleColor:XQBColorTextMostLight forState:UIControlStateNormal];
        [_leftBtn setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];

        _leftImgView=[[UIImageView alloc]init];
        _leftImgView.image=[UIImage imageNamed:@"login_location_down.png"];
        [_leftBtn addSubview:_leftImgView];
        
        [self.leftView addSubview:_leftBtn];
        
        _searchImgView=[[UIImageView alloc]init];
        _searchImgView.image=[UIImage imageNamed:@"login_location_search.png"];
        [self.leftView addSubview:_searchImgView];
        
    }
    return self;
}

-(void)layoutSubviews
{
    [super layoutSubviews];
    
    if (_isNoLeftTitle) {
        self.leftView.frame=CGRectMake(0, 0, 35, self.frame.size.height);
        _leftBtn.frame=CGRectMake(0, 0, 0, 0);
        
        _leftImgView.frame=CGRectMake(0, 0, 0, 0);
        _searchImgView.frame=CGRectMake(10, (self.frame.size.height-15)/2, 15, 15);
    }
    else{
        NSDictionary *attributes=@{NSFontAttributeName: XQBFontMiddle};
        CGRect titleFrame=[_leftTitle boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil];
        
        
        self.leftView.frame=CGRectMake(0, 0, 62+titleFrame.size.width, self.frame.size.height);
        
        _leftBtn.frame=CGRectMake(10, 0, titleFrame.size.width+22, self.frame.size.height);
        
        [_leftBtn setTitle:_leftTitle forState:UIControlStateNormal];
        
        _leftImgView.frame=CGRectMake(titleFrame.size.width+10, (self.frame.size.height-5)/2, 10, 5);
        
        _searchImgView.frame=CGRectMake(titleFrame.size.width+37, (self.frame.size.height-15)/2, 15, 15);
    }
    
}

-(void)btnClickHandle:(id)sender
{
    _btnClickBlock();
}

-(void)setLeftTitle:(NSString *)leftTitle
{
    _leftTitle=leftTitle;
    _isNoLeftTitle=NO;
    [self setNeedsLayout];
}
@end