使用 rand() 随机显示图像
我只是摆弄小应用程序，尝试学习 SDK 和 ObjC 2。
我尝试随机显示图像，并且不断寻找不同的显示图片的方式。我已将图片上传到 SDK 资源文件夹中。
无论如何，这是我的代码。有人可以引导我走向正确的方向吗？
#import "randomViewController.h"
@implementation randomViewController
//not sure if this is the right way to do it really.
NSArray *comImage = [NSArray arrayWithObjects:
[UIImage imageNamed:@"rock.png"],
[UIImage imageNamed:@"paper.png"],
[UIImage imageNamed:@"scissors.png"],
nil];
- (IBAction) randButton {
int text = rand() % 3;
switch (text) {
case 0:
textView.text = @"Rock";
break;
case 1:
textView.text = @"Paper";
break;
case 2:
textView.text = @"Scissors";
break;
default:
break;
}
}
Im just fiddling around with small apps, trying to learn the SDK and ObjC 2.
Im trying to display an image randomly and I keep finding different ways up displaying a picture. I have uploaded the picture into the SDKs resources folder.
Anyway, here is my code. Can someone steer me in the right direction.
#import "randomViewController.h"
@implementation randomViewController
//not sure if this is the right way to do it really.
NSArray *comImage = [NSArray arrayWithObjects:
[UIImage imageNamed:@"rock.png"],
[UIImage imageNamed:@"paper.png"],
[UIImage imageNamed:@"scissors.png"],
nil];
- (IBAction) randButton {
int text = rand() % 3;
switch (text) {
case 0:
textView.text = @"Rock";
break;
case 1:
textView.text = @"Paper";
break;
case 2:
textView.text = @"Scissors";
break;
default:
break;
}
}
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我会这样做：
显然，您可以保留 myImageNames，因此如果您认为值得的话，则不必每次运行都重新创建它。
编辑：
知道了。查看更新后的代码。它假设您已经将一个名为 myUIImageView 的 UIImageView 添加到您的视图中。如果屏幕上已有 UIButton，我假设您知道如何执行此操作。
要添加 UIImageView：
在标头中声明 UIImageView *myUIImageView。
假设您使用 xib，请将其放入 viewDidLoad 中：
将 x、y、宽度和高度替换为适当的值。他们将确定 UIImageView 在视图中出现的位置以及它的大小。
I would do it this way:
Obviously you can hold on to myImageNames so you don't have to recreate it every run if you deem it worthwhile.
Edit:
Got it. See the updated code. It assumes you have already added a UIImageView called myUIImageView to your view. I assume you know how to do this if you already have a UIButton on the screen.
To add a UIImageView:
Declare the UIImageView *myUIImageView in your header.
Place this in your viewDidLoad assuming you use an xib:
Replace x, y, width and height with the appropriate values. They will determine where in the view the UIImageView appears and how large it is.
要显示图像，您需要添加一个
UIImageView并将其image属性设置为您想要的任何UIImage。查看 David 的答案，了解如何使用objectAtIndex:获取随机图像，然后将图像视图的image属性设置为该图像。To display images, you want to add a
UIImageViewand set itsimageproperty to whateverUIImageyou want. Look at David's answer to see how to get a random image usingobjectAtIndex:, then set theimageproperty of your image view to that.