xcode 的布尔函数
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Bool function for xcode
提问by Hyman Nick
I am practicing some bool functions and I seem to be stuck any help will be appreciated. I must be making some little mistake.
我正在练习一些布尔函数，但我似乎被困住了，任何帮助将不胜感激。我一定是犯了一些小错误。
-(BOOL) checkForWin
{
if ([[dictionary valueForKey:[cowsShuffled objectAtIndex:cowsCard]] intValue] == 2{
return YES;
}
}
-(void) moo
{
if (checkForWin == YES) {
NSLog (@"foo");
}
}
回答by Marcelo Cantos
You need to call the method (not function), and you don't need to compare to YES. The ifstatement does that implicitly:
您需要调用方法（而不是函数），并且不需要与 YES 进行比较。该if语句隐含地做到了这一点：
if ([self checkForWin]) …
Also note that checkForWinhas a problem: it doesn't return anything if the ifstatement fails. It should be simply:
另请注意，checkForWin有一个问题：如果if语句失败，它不会返回任何内容。它应该是简单的：
- (BOOL)checkForWin{
return [[dictionary valueForKey:[cowsShuffled objectAtIndex:cowsCard]] intValue] == 2;
}
Footnote:Strictly speaking, if (x) …isn't exactly the same as if (x == YES) …. It's actually closer to if (x != NO) …, but of course that's the same thing for most intents and purposes (and those for which it isn't are largely pathological).
脚注：严格来说，if (x) …与if (x == YES) …. 它实际上更接近于if (x != NO) …，但当然，对于大多数意图和目的（以及那些不是主要是病态的）来说，这当然是一样的。
回答by DrummerB
Your method call is wrong. You call a method like this: [object method].
你的方法调用是错误的。你叫这样的方法：[object method]。
In your case [self checkForWin].
在你的情况下[self checkForWin]。
