iOS 图片比例缩放

方法

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//Resize image   - (UIImage *)resizeImage:(UIImage *)image              withQuality:(CGInterpolationQuality)quality                     rate:(CGFloat)rate {     UIImage *resized = nil;     CGFloat width = image.size.width * rate;     CGFloat height = image.size.height * rate;           UIGraphicsBeginImageContext(CGSizeMake(width, height));     CGContextRef context = UIGraphicsGetCurrentContext();     CGContextSetInterpolationQuality(context, quality);     [image drawInRect:CGRectMake(0, 0, width, height)];     resized = UIGraphicsGetImageFromCurrentImageContext();     UIGraphicsEndImageContext();           return resized; }

　　

使用

+ View Code?

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UIImageView *theImageView = [[UIImageView alloc]init];           theImageView.frame = CGRectMake(0, 64, 320, 400);           UIImage *aImage = [UIImage imageNamed:@"shenlin.png"];           UIImage *resizeImage = [self resizeImage:aImage withQuality:kCGInterpolationNone rate:0.2];     theImageView.image = resizeImage;     theImageView.frame = CGRectMake(0, 64, resizeImage.size.width, resizeImage.size.height);     NSLog(@"%@",NSStringFromCGSize(resizeImage.size));           [self.view addSubview:theImageView];