@EvGeniy Ilyin EvGeniy Ilyin 的解决方案是最好的。
我基于这个解决方案写了一个 Objective-C 版本。
创建一个UIImage类别,并在UIImage+YourCategory.h中通告两个类方法
+ (UIImage *)imageWithColor:(UIColor *)color withSize:(CGRect)imageRect;
+ (UIImage *)roundImage:(UIImage *)image withRadius:(CGFloat)radius;
UIImage+YourCategory.m
中的实现方法
// create image with your color
+ (UIImage *)imageWithColor:(UIColor *)color withSize:(CGRect)imageRect
{
UIGraphicsBeginImageContext(imageRect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, imageRect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
// get a rounded-corner image from UIImage instance with your radius
+ (UIImage *)roundImage:(UIImage *)image withRadius:(CGFloat)radius
{
CGRect rect = CGRectMake(0.0, 0.0, 0.0, 0.0);
rect.size = image.size;
UIGraphicsBeginImageContextWithOptions(image.size, NO, [UIScreen mainScreen].scale);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect
cornerRadius:radius];
[path addClip];
[image drawInRect:rect];
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
在您的ViewController 中创建自己的UISearchBar
CGRect rect = CGRectMake(0.0, 0.0, 44.0, 30.0);
UIImage *colorImage = [UIImage imageWithColor:[UIColor yourColor] withSize:rect];
UIImage *finalImage = [UIImage roundImage:colorImage withRadius:4.0];
[yourSearchBar setSearchFieldBackgroundImage:finalImage forState:UIControlStateNormal];