iOS 开发修改 searchbar 的背景颜色

/**先取消背景颜色*/

- (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;
}

/**调用*/

_searchBar.backgroundImage = [self
imageWithColor:[UIColor
redColor] size:self.searchBar.bounds.size];