自定义搜索框

#import <UIKit/UIKit.h>

@interface CustomSearchBar : UIView

//以便外部修改UI
@property(nonatomic,strong) UITextField  *textField;
@property(nonatomic,strong) UITextField  *bgView;

//声明一个类方法，快速创建一个自定义的view
+(instancetype)searchBar;

@end

//
//  CustomSearchBar.m
//  RuntimeLearn
//
//  Created by luo.h on 16/3/14.
//  Copyright © 2016年 appledev. All rights reserved.
//

#define RGBCOLOR(r,g,b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]

#import "CustomSearchBar.h"

@interface CustomSearchBar ()

@end


@implementation CustomSearchBar


- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self addSubview:self.bgView];
        [self addSubview:self.textField];
    }
    return self;
}


+(instancetype)searchBar
{
    return [[self alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 44)];
}


- (UITextField  *)textField {
    if(_textField == nil) {
        _textField = [[UITextField  alloc] init];
        _textField.font = [UIFont systemFontOfSize:15];
        _textField.placeholder = @"搜索";

        UIImageView *searchIcon = [[UIImageView alloc] init];
        searchIcon.image = [UIImage imageNamed:@"search_search_icon"];
        // contentMode：default is UIViewContentModeScaleToFill，要设置为UIViewContentModeCenter：使图片居中，防止图片填充整个imageView
        searchIcon.contentMode = UIViewContentModeCenter;
        
        CGRect frame = CGRectZero;
        frame.size = CGSizeMake(30, 30);
        searchIcon.frame =frame;
        
        _textField.leftView = searchIcon;
        _textField.leftViewMode = UITextFieldViewModeAlways;
        _textField.frame=CGRectMake(5, 5,self.bounds.size.width-10, self.bounds.size.height-10);
        
        _textField.backgroundColor=[UIColor whiteColor];
        _textField.layer.borderColor=RGBCOLOR(200, 200, 200).CGColor;
        _textField.layer.borderWidth=1;
        
        //设置圆角效果
        _textField.layer.cornerRadius = (self.bounds.size.height-10)/2;
        _textField.layer.masksToBounds = YES;
    }
    return _textField;
}


- (UIView  *)bgView {
	if(_bgView == nil) {
        //背景视图
        _bgView = [[UIView alloc] initWithFrame:self.bounds];
        _bgView.backgroundColor =RGBCOLOR(225, 227, 234);
	}
	return _bgView;
}

@end