如何按比例缩放UIImageView ?

我有一个UIImageView目标是按比例缩小它通过给它一个高度或宽度。

UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg"]]];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; 

//Add image view
[self.view addSubview:imageView];   

//set contentMode to scale aspect to fit
imageView.contentMode = UIViewContentModeScaleAspectFit;

//change width of frame
CGRect frame = imageView.frame;
frame.size.width = 100;
imageView.frame = frame;

图像确实调整了大小，但位置不在左上方。缩放image/imageView的最佳方法是什么?我如何纠正位置?

当前回答

UIImageView + Scale.h:

#import <Foundation/Foundation.h>

@interface UIImageView (Scale)

-(void) scaleAspectFit:(CGFloat) scaleFactor;

@end

UIImageView + Scale.m:

#import "UIImageView+Scale.h"

@implementation UIImageView (Scale)


-(void) scaleAspectFit:(CGFloat) scaleFactor{

    self.contentScaleFactor = scaleFactor;
    self.transform = CGAffineTransformMakeScale(scaleFactor, scaleFactor);

    CGRect newRect = self.frame;
    newRect.origin.x = 0;
    newRect.origin.y = 0;
    self.frame = newRect;
}

@end

2013-11-20 16:22:12

其他回答

这对我来说很好Swift 2.x:

imageView.contentMode = .ScaleAspectFill
imageView.clipsToBounds = true;

2016-10-07 16:13:49

下面是如何轻松扩展它的方法。

这适用于2。x的模拟器和iPhone。

UIImage *thumbnail = [originalImage _imageScaledToSize:CGSizeMake(40.0, 40.0) interpolationQuality:1];

2008-10-10 22:17:54

我们可以这样调整UIImage的大小

image = [UIImage imageWithCGImage:[image CGImage] scale:2.0 orientation:UIImageOrientationUp];

2011-05-25 14:55:59

设置您的ImageView通过选择模式为方面填充，并选中剪辑子视图框。

2015-04-03 03:31:22

设置你的UIimageview的比例.........

2016-12-16 09:37:32

如何按比例缩放UIImageView ?

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