项目中几乎肯定是要用搜索这项功能的，但是关于搜索框的圆角问题一直在困扰我！所以好好找了一下解决办法，上干货！

1.设置UISearchBar圆角

首先写一个UIImage的分类

#import <UIKit/UIKit.h>

@interface UIImage (XYColor)

/** 返回一个传入颜色值的iamge对象 */
+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size;

@end

#import "UIImage+XYColor.h"

@implementation UIImage (XYColor)

/** 返回一个传入颜色值的iamge对象 */
+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size{
    CGRect rect = CGRectMake(0, 0, size.width, size.height);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

@end

用的时候如下

searchBar.backgroundImage = [UIImage imageWithColor:[UIColor whiteColor] size:CGSizeMake(SCREEN_WIDTH - 80*WidthRatio, 30*WidthRatio)];
searchBar.layer.masksToBounds = YES;
searchBar.layer.cornerRadius = 15*WidthRatio;

这个时候你就会发现你的SearchBar完美设置了圆角

2.设置UISearchBar的placeholder的字体大小和颜色

UITextField *textfield = [searchBar valueForKey:@"_searchField"];
[textfield setValue:FontThin(14.0f*WidthRatio) forKeyPath:@"_placeholderLabel.font"];
[textfield setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];

好了干货完毕，继续搬砖去了，喜欢的小伙伴可以点个赞在走呀~