iOS 设置自带UISearchBar的背景颜色(并改为圆角)

/** 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;
}
 
然后在viewdidload里面
/** 设置背景图片 */
    [_searchBar setBackgroundImage:[UIImage imageNamed:@"red_nav_bar"]];   //这里图片的颜色和导航栏一样
/** 设置背景色 */
   [_searchBar setBackgroundColor:[UIColor redColor]];
/** 设置文本框背景 * 
[_searchBar setSearchFieldBackgroundImage:[UIImage imageNamed:@"imageView"] forState:UIControlStateNormal];
 
 
    //更改search圆角
        UITextField *searchField = [self.searchBar valueForKey:@"searchField"];
        if (searchField) {
            [searchField setBackgroundColor:[UIColor whiteColor]];
            searchField.layer.cornerRadius = 14.0f;
            searchField.layer.borderColor = [UIColor colorWithRed:247/255.0 green:75/255.0 blue:31/255.0 alpha:1].CGColor;
            searchField.layer.borderWidth = 1;
            searchField.layer.masksToBounds = YES;
        }