如何设置视图的背景图像? [英] How to set background image of a view?

问题描述

我是Obj-C/Cocoa Touch/iPhone OS的初学者.

I am a beginner at Obj-C/Cocoa Touch/iPhone OS.

我希望每次调用该视图时，应用程序的背景都有不同的图像.

I wish to have a background for my app with different images everytime the the view is called.

说我有10张图片.我已经这样使用了:

Say I have 10 images. I 've used it like this:

//random image generation
NSString* imageName;
int aRandomNumber = arc4random() % 10;
imageName =[NSString stringWithFormat:@"g%d.jpg",aRandomNumber]; 
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:imageName]]];
NSLog(@"aRandomNumber is %d", aRandomNumber);
//random image is generated

工作正常

• 现在，说我的视图上有文本标签，并且由于图像颜色而导致文本无法正确显示. 我该如何使它变得透明? (我猜在Interface Builder中它叫alpha.)
• 说我的图片不是320x480.如何设置它以填满整个视图?

• Now, say I have text labels on my view and the text isn't displaying correctly due to image colors. How can I make it a little transparent? (I guess in Interface Builder its called alpha.)
• Say my image isn't 320x480. How do I set it to fill the entire view?

我该如何使用UIView/UIImageView?

How can I do it with UIView/UIImageView?

我在文档中找到了initWithHue:saturation:brightness:alpha:，但是它不起作用:

I found initWithHue:saturation:brightness:alpha: in the documentation but it's not working:

self.view.backgroundColor = [[UIColor alloc] initWithHue:0.0 saturation:1.0 brightness:1.0 alpha:1.0];

请帮助！

有朋友建议........

A friend suggested........

self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:imageName]]];

..........他告诉我它效率更高，因为它不会将图像保存在缓存中.

..........he told it's more efficient because it doesn't save the image in the cache.

推荐答案

self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"imageName.png"]];

更多信息(带有示例项目)

这篇关于如何设置视图的背景图像?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！