我试图分离alloc和initWithRed ...消息，但似乎不起作用 [英] I tried to separate alloc and initWithRed... messages, but it doesn't seems to work

问题描述

很抱歉，如果有人问这个问题，但是作为一个初学者，我需要一个非常具体的答案.哪里有错，请多多指教.

Sorry if it is asked somewhere, but as a beginner, I need a very specific answer for my question. Where is wrong, correction and suggestions.

我在应用程序didFinishLaunchingWithOption下编写了这些代码:

I write those under application didFinishLaunchingWithOption:

UIColor *myBackgroundColor = [[UIColor alloc]initWithRed:.87 green:.77 blue:.56 alpha:.99];
[window setBackgroundColor:myBackgroundColor];

它起作用了，并且改变了背景的颜色，然后我尝试将这两个消息分开.

It worked, and change the color of the background, and then I try to separate those two messages.

UIColor *myBackgroundColor = [UIColor alloc];
[myBackgroundColor initWithRed:.87 green:.77 blue:.56 alpha:.99]
[window setBackgroundColor:myBackgroundColor];

我应该如何编码才能使其正确运行?我将需要理由和更正.非常感谢.

How should I code to make it run correctly? I will need both reason and corrections. Thanks a lot.

推荐答案

您不能假定 alloc 和 init 具有相同的返回值.

You can't assume that alloc and init has the same return value.

以下应能工作:

UIColor *myBackgroundColor = [UIColor alloc];
myBackgroundColor = [myBackgroundColor initWithRed:.87 green:.77 blue:.56 alpha:.99]
[window setBackgroundColor:myBackgroundColor];

我不明白为什么您要添加额外的行.

I don't understand why you'd want to add the extra line though.

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