最近需要优化项目，把搜索框改了，样式如下:

明似水.png

本以为很简单，结果弄一下发现不对，特意把解决方法记录下来：

UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, kAdaptedWidth(254), 30)];
    searchBar.barStyle = UIBarStyleDefault;
    searchBar.searchBarStyle = UISearchBarStyleDefault;
    searchBar.placeholder = @"搜索内容";
    searchBar.delegate = self;
    searchBar.showsCancelButton = NO;
    searchBar.layer.cornerRadius = 30/2;
    searchBar.clipsToBounds = YES;
    
    [searchBar setImage:[UIImage imageNamed:@"djy_icon_chakan"] forSearchBarIcon:UISearchBarIconSearch state:UIControlStateNormal];
    searchBar.backgroundImage = [self imageWithColor:[UIColor clearColor] size:searchBar.bounds.size];
    [searchBar setSearchFieldBackgroundImage:[UIImage imageNamed:@"djy_quanyi_dise"] forState:UIControlStateNormal];
    
    UITextField *textField = (UITextField *)[HBHuTool findViewWithClassName:@"UITextField" inView:searchBar];
    textField.textColor = Color_label_DataTitle;
    textField.font = FONT(12);
    textField.placeholder = @"输入邀请码/名字/手机号";

注意的是叫UI切图把底色的图切了

//取消searchbar背景色
- (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;
}

UISearchBar适配iOS13方法：

// 替代方案 2，遍历获取指定类型的属性
+ (UIView *)findViewWithClassName:(NSString *)className inView:(UIView *)view{
    Class specificView = NSClassFromString(className);
    if ([view isKindOfClass:specificView]) {
        return view;
    }
    
    if (view.subviews.count > 0) {
        for (UIView *subView in view.subviews) {
            UIView *targetView = [self findViewWithClassName:className inView:subView];
            if (targetView != nil) {
                return targetView;
            }
        }
    }
    
    return nil;
}

END.