blocks|key|1377008|text|如果你已经有了一个指向UIImageView的IBOutlet，那么你所要做的就是抓取一个图像并在接收器上调用setImage+(UIImageView)。下面是两个抓取图像的示例。一个来自Web，另一个添加到Xcode中的Resources文件夹中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1377009|UIImage+*image+=+[[UIImage+alloc]+initWithData:[NSData+dataWithContentsOfURL:[NSURL+URLWithString:@"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg"]]];|code-block|syntax|javascript|1377010|或|1377011|UIImage+*image+=+[UIImage+imageNamed:+@"cell.png"];|1377012|一旦你有了一个图像，你就可以设置UIImageView：|1377013|[imageView+setImage:image];|1377014|上面的代码行假设imageView是您的IBOutlet。|1377015|就这样!如果你想变得更花哨，你可以将图像添加到UIView中，然后添加过渡效果。|1377016|附注:不包括内存管理。|1377017|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

If you have an IBOutlet to a UIImageView already, then all you have to do is grab an image and call setImage on the receiver (UIImageView). Two examples of grabbing an image are below. One from the Web, and one you add to your Resources folder in Xcode.

<pre><code>UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://farm4.static.flickr.com/3092/2915896504_a88b69c9de.jpg"]]];
</code></pre>

or

<pre><code>UIImage *image = [UIImage imageNamed: @"cell.png"];
</code></pre>

Once you have an Image you can then set UIImageView:

<pre><code>[imageView setImage:image];
</code></pre>

The line above assumes imageView is your IBOutlet.

That's it! If you want to get fancy you can add the image to an UIView and then add transitions. 

P.S. Memory management not included.

blocks|key|1592234|text|遵循乔丹的建议(实际上应该是有效的)，尝试将UIImageView设置为可见：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1592235|+[imageView+setHidden:+NO];|code-block|syntax|javascript|1592236|另外，别忘了把它附加到主UIView上：|1592237|[mainView+addSubview:+imageView];|1592238|并把它带到前面：|1592239|[mainView+bringSubviewToFront:+imageView];|1592240|希望所有这些步骤的结合将帮助你解开这个谜团。|1592241|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Following Jordan's advice (which should work actually), try to set the UIImageView to be visible: 

<pre><code> [imageView setHidden: NO];
</code></pre>

and also - don't forget to attach it to the main UIView: 

<pre><code>[mainView addSubview: imageView];
</code></pre>

and to bring to the front: 

<pre><code>[mainView bringSubviewToFront: imageView];
</code></pre>

Hope combining all these steps will help you solve the mystery.

blocks|key|1592274|text|这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1592275|[ImageViewName+setImage:[UIImage+imageNamed:+@"ImageName.png"]];|code-block|syntax|javascript|1592276|确保在.h文件中正确声明了ImageView，并将其与IB元素链接。|1592277|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This worked for me

<pre><code>[ImageViewName setImage:[UIImage imageNamed: @"ImageName.png"]];
</code></pre>

Make sure that the ImageView is declared properly in the .h file and is linked with the IB element.

blocks|key|1377119|text|对于那些可能在谷歌上搜索以试图解决他们的问题的人来说，记住在你的头文件中正确地声明属性，并在你的实现文件中合成UIImageView……如果没有getter和setter方法，将很难以编程方式设置图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1377120|#import+<UIKit/UIKit.h>

@interface+YOURCONTROLLERNAME+:+UIViewController+{
++++IBOutlet+UIImageView+*imageToDisplay;
}

@property+(nonatomic,+retain)+IBOutlet+UIImageView+*imageToDisplay;

@end|code-block|syntax|javascript|1377121|然后在你的.m中：|1377122|@implementation+YOURCONTROLLERNAME

@synthesize+imageToDisplay;
//etc,+rest+of+code+goes+here|1377123|从那里开始，你应该可以使用下面这样的东西来设置你的图像。|1377124|[YOURCONTROLLER.imageToDisplay+setImage:[UIImage+imageNamed:value]];|1377125|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For the purpose of people who may be googling this to try to solve their problem, remember to properly declare the property in your header file and to synthesize the UIImageView in your implementation file... It'll be tough to set the image programmatically without getter and setter methods.

<pre><code>#import &lt;UIKit/UIKit.h&gt;

@interface YOURCONTROLLERNAME : UIViewController {
 IBOutlet UIImageView *imageToDisplay;
}

@property (nonatomic, retain) IBOutlet UIImageView *imageToDisplay;

@end
</code></pre>

and then in your .m :

<pre><code>@implementation YOURCONTROLLERNAME

@synthesize imageToDisplay;
//etc, rest of code goes here
</code></pre>

From there you should be fine using something like the following to set your image.

<pre><code>[YOURCONTROLLER.imageToDisplay setImage:[UIImage imageNamed:value]];
</code></pre>

blocks|key|1592338|text|请注意，在将视图添加到场景之前，NIB文件不会关联所有IBOutlets。如果您正在手动连接(如果在单独的NIB中，您可能会这样做)，请记住这一点很重要。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1592339|因此，如果我的测试视图控制器有一个由nib连接的"imageView“，这可能无法工作：|1592340|++testCardViewController.imageView.image+=+[UIImage+imageNamed:@"EmptyCard.png"];
++[self.view+addSubview:testCardViewController.view];|code-block|syntax|javascript|1592341|但这将会：|1592342|++[self.view+addSubview:testCardViewController.view];
++testCardViewController.imageView.image+=+[UIImage+imageNamed:@"EmptyCard.png"];|1592343|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Note that the NIB file doesn't wire up all the IBOutlets until the view has been added to the scene. If you're wiring things up manually (which you might be doing if things are in separate NIBs) this is important to keep in mind.

So if my test view controller has an "imageView" wired by a nib, this probably won't work:

<pre><code> testCardViewController.imageView.image = [UIImage imageNamed:@"EmptyCard.png"];
 [self.view addSubview:testCardViewController.view];
</code></pre>

But this will:

<pre><code> [self.view addSubview:testCardViewController.view];
 testCardViewController.imageView.image = [UIImage imageNamed:@"EmptyCard.png"];
</code></pre>

blocks|key|1592384|text|我的问题是，我试图在另一个线程中更改图像。我喜欢这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1592385|-+(void)changeImage+{
++++backgroundImage.image+=+[UIImage+imageNamed:@"img.png"];
}|code-block|syntax|javascript|1592386|通过以下方式进行呼叫：|1592387|[self+performSelectorOnMainThread+:+@selector(changeImage)+withObject:nil+waitUntilDone:NO];|1592388|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

My problem was that I tried to change the image in an other thread. I did like this:

<pre><code>- (void)changeImage {
 backgroundImage.image = [UIImage imageNamed:@"img.png"];
}
</code></pre>

Call with:

<pre><code>[self performSelectorOnMainThread : @selector(changeImage) withObject:nil waitUntilDone:NO];
</code></pre>

blocks|key|1592391|text|UIColor+*+background+=+[[UIColor+alloc]+initWithPatternImage:
++++[UIImage+imageNamed:@"anImage.png"]];

self.view.backgroundColor+=+background;
[background+release];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1592392|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>UIColor * background = [[UIColor alloc] initWithPatternImage:
 [UIImage imageNamed:@"anImage.png"]];

self.view.backgroundColor = background;
[background release];
</code></pre>

blocks|key|1377224|text|imageView.image+=+[UIImage+imageNamed:@"myImage.png"];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1377225|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>imageView.image = [UIImage imageNamed:@"myImage.png"];
</code></pre>

blocks|key|1377276|text|这个问题已经有很多答案了。不幸的是，没有一个对我有效。所以为了完善，我添加了一些对我有帮助的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1377277|我有多个具有相同名称的图像-所以我将它们放在子文件夹中。并且我有我想要显示的图像文件的完整路径。使用完整路径时，imageNamed:+(如上面所有解决方案中使用的)不起作用，并且是错误的方法。|offset|length|style|CODE|1377278|相反，我现在使用imageWithContentsOfFile:，如下所示：|1377279|self.myUIImage.image+=+[UIImage+imageWithContentsOfFile:_currentWord.imageFileName];|code-block|syntax|javascript|1377280|不知道，有没有人读到那么远？|1377281|如果是这样，这一条对你很有帮助:请投赞成票。;-)|1377282|entityMap^0|0|1K|B|0|8|O|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

This question already had a lot of answers. Unfortunately none worked for me. 
So for the sake of completenes I add what helped me:

I had multiple images with the same name - so I ordered them in sub folders. And I had the full path to the image file I wanted to show. With a full path <code>imageNamed:</code> (as used in all solutions above) did not work and was the wrong method. 

Instead I now use <code>imageWithContentsOfFile:</code> like so:

<pre><code>self.myUIImage.image = [UIImage imageWithContentsOfFile:_currentWord.imageFileName];
</code></pre>

Don't know, if anyone reads that far?

If so and this one helped you: please vote up.
;-)

blocks|key|1592474|text|myUIImageview.image+=+UIImage+(named:"myImage.png")|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1592475|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>myUIImageview.image = UIImage (named:"myImage.png")
</code></pre>

blocks|key|1592516|text|如果您使用size+of+UIImageView来设置UIScrollView+contentSize和/或计算缩放比例，请不要忘记在更改图像后调用sizeToFit()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1592517|let+image+=+UIImage(named:+"testImage")
imageView.image+=+image
imageView.sizeToFit()
scrollView.contentSize+=+imageView.bounds.size|code-block|syntax|javascript|1592518|entityMap^0|22|B|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Don't forget to call <code>sizeToFit()</code> after you change image if you then use size of UIImageView to set UIScrollView contentSize and/or compute zoom scale

<pre><code>let image = UIImage(named: "testImage")
imageView.image = image
imageView.sizeToFit()
scrollView.contentSize = imageView.bounds.size
</code></pre>

blocks|key|1377357|text|要在imageView上设置图像，请使用下面的代码行，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1377358|self.imgObj.image=[UIImage+imageNamed:@"yourImage.png"];+++++++++++++++++++++++++|code-block|syntax|javascript|1377359|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To set image on your imageView use below line of code,

<pre><code>self.imgObj.image=[UIImage imageNamed:@"yourImage.png"]; 
</code></pre>

blocks|key|1377438|text|使用Swift+5+(XCode+10.3)只是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1377439|yourImageView.image+=+UIImage(named:+"nameOfTheImage")|code-block|syntax|javascript|1377440|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Working with Swift 5 (XCode 10.3) it's just

<pre><code>yourImageView.image = UIImage(named: "nameOfTheImage")
</code></pre>

I have an <code>IBOutlet</code> to a <code>UIImageView</code>, but when I look at the <code>UIImageView</code> doc, I can't see any hints about programmatically changing it. Do I have to fetch an <code>UIImage</code> object from that <code>UIImageView</code>?

How can I change the image displayed in a UIImageView programmatically?

内存管理

Swift

Xcode

我有一个指向UIImageView的IBOutlet，但是当我查看UIImageView文档时，我看不到任何关于以编程方式更改它的提示。我是否必须从该UIImageView获取UIImage对象

问如何以编程方式更改UIImageView中显示的图像？
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问如何以编程方式更改UIImageView中显示的图像？
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