UIImageView显示处理（圆角，变灰,uiimage放大）

来源：互联网发布：java游戏nba2010中文编辑：程序博客网时间：2024/05/16 05:45

1.UIImageView圆角

CALayer *l = [cell.imgAvatarImage layer];   [l setMasksToBounds:YES];[l setCornerRadius:6.0];

2.UIImageView显示圆形

    UIImageView *imageView1 = [[UIImageViewalloc] initWithImage:[UIImageimageNamed:@"image.png"]];    imageView1.frame = CGRectMake(60,100, 100, 100);    imageView1.layer.masksToBounds =YES;    imageView1.layer.cornerRadius =50;    [self.view addSubview:imageView1];

3.UIImageView变灰效果

+ (UIImage*)getGrayImage:(UIImage*)sourceImage{    int width = sourceImage.size.width;    int height = sourceImage.size.height;        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();    CGContextRef context = CGBitmapContextCreate (nil,width,height,8,0,colorSpace,kCGImageAlphaNone);    CGColorSpaceRelease(colorSpace);        if (context == NULL) {        return nil;    }        CGContextDrawImage(context,CGRectMake(0, 0, width, height), sourceImage.CGImage);    CGImageRef grayImageRef = CGBitmapContextCreateImage(context);    UIImage *grayImage = [UIImage imageWithCGImage:grayImageRef];    CGContextRelease(context);    CGImageRelease(grayImageRef);        return grayImage;}

4 UIImage设置显示大小

- (UIImage *)scaleToSize:(UIImage *)img size:(CGSize)size{     UIGraphicsBeginImageContext(size);         [img drawInRect:CGRectMake(0, 0, size.width, size.height)];        UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();        // 使当前的context出堆栈        UIGraphicsEndImageContext();    // 返回新的改变大小后的图片    return scaledImage;}

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