有的时候，使用iOS自带的控件不符合变态产品狗的需求时，我们只好自定义控件来满足他们。在此处，我们通过创建一个GUSearchBar类，继承自UITextField类来自定义搜索框。
创建GUSearchBar
代码如下：GUSearchBar.h
#import <UIKit/UIKit.h>
@interface GUSearchBar : UITextField
+(instancetype) searchBar;
@end
GUSearchBar.m
#import "GUSearchBar.h"
@implementation GUSearchBar
-(id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.background = [UIImage resizedImage:@"searchbar_textfield_background"];
self.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
UIImageView *leftView = [[UIImageView alloc] init];
leftView.image = [UIImage imageWithName:@"searchbar_textfield_search_icon"];
leftView.width = leftView.image.size.width + 10;
leftView.height = leftView.image.size.height;
leftView.contentMode = UIViewContentModeCenter;
self.leftView = leftView;
self.leftViewMode = UITextFieldViewModeAlways;
self.clearButtonMode = UITextFieldViewModeAlways;
self.placeholder = @"搜索";
}
return self;
}
+(instancetype) searchBar
{
return [[self alloc] init];
}
@end
注意：上述有类似leftView.width，leftView.height这样的语法是使用了自定义UIView的扩展分类，详情请点击UIView扩展。
使用
GUSearchBar *searchBar = [[GUSearchBar alloc] init];
searchBar.width = 350;
searchBar.height = 30;
self.navigationItem.titleView = searchBar;
使用效果
GUSearchBar
来自RecluseGu的博客：http://reclusegu.github.io/2016/06/29/Customizing-UISearchBar-with-UITextField/
