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

设置你的UIimageview的比例.........

2016-12-16 09:37:32

其他回答

修复容易，一旦我找到文档!

 imageView.contentMode = .scaleAspectFit

2010-02-20 00:29:24

设置你的UIimageview的比例.........

2016-12-16 09:37:32

我觉得你可以

image.center = [[imageView window] center];

2008-10-09 03:04:24

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

imageView.contentMode = UIViewContentModeScaleAspectFill;
imageView.clipsToBounds = YES;

2012-12-11 07:16:54

如何按比例缩放UIImageView ?

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