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

斯威夫特:

self.imageViews.contentMode = UIViewContentMode.ScaleToFill

2015-09-17 09:33:38

其他回答

我使用以下代码。imageCoverView是UIView持有UIImageView

if (image.size.height<self.imageCoverView.bounds.size.height && image.size.width<self.imageCoverView.bounds.size.width)
{
    [self.profileImageView sizeToFit];
    self.profileImageView.contentMode =UIViewContentModeCenter
}
else
{
    self.profileImageView.contentMode =UIViewContentModeScaleAspectFit;
}

2016-02-25 08:08:03

斯威夫特:

self.imageViews.contentMode = UIViewContentMode.ScaleToFill

2015-09-17 09:33:38

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

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

我已经看到了一些关于缩放类型的讨论，所以我决定整理一篇关于一些最流行的内容模式缩放类型的文章。

如何按比例缩放UIImageView ?

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