objective-c BOOL 到 NSString
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BOOL to NSString
提问by Craig
If I have a method that returns a BOOL, how do I cast that to an NSStringso I can print it out in console?
如果我有一个返回 a 的方法，BOOL我如何将它转换为 anNSString以便我可以在控制台中打印出来？
For example, I tried doing this, which isn't working:
例如，我尝试这样做，但不起作用：
NSLog(@"Is Kind of NSString:", ([thing isKindOfClass:[NSString class]]) ? @"YES" : @"NO");
But I really want to actually turn the return value into an NSString. I know it's a primitive data type, so I can't call methods on it. Do I have to create a string separately and then use the Bool as a parameter in a method on NSString?
但我真的很想将返回值实际转换为 NSString。我知道它是一种原始数据类型，所以我不能调用它的方法。我是否必须单独创建一个字符串，然后在 NSString 的方法中使用 Bool 作为参数？
回答by Andrew Grant
Use a ternary operator:
使用三元运算符：
BOOl isKind= [thing isKindOfClass:[NSString class]];
NSLog(@"Is Kind of NSString: %d", isKind);
NSLog(@"Is Kind of NSString: %@", isKind ? @"YES" : @"NO");
回答by Andrew Grant
You need a formatting specifier in your format string:
您的格式字符串中需要一个格式说明符：
NSLog(@"Is Kind of NSString: %@", ([thing isKindOfClass:[NSString class]]) ? @"YES" : @"NO");
回答by 5bars
In the background BOOL acts like an int type so you can use %i to test for a BOOL type's value in NSLog:
在后台 BOOL 的行为类似于 int 类型，因此您可以使用 %i 在 NSLog 中测试 BOOL 类型的值：
BOOL a = YES;
BOOL b = NO;
NSLog(@"a is %i and b is %i", a, b);
// Output: a is 1 and b is 0
回答by Patrick Perini
So, I know that this is really old, but I thought I might as well toss my solution into the ring. I do:
所以，我知道这真的很旧，但我想我不妨把我的解决方案扔进戒指。我愿意：
#define NSStringFromBOOL(aBOOL) ((aBOOL) ? @"YES" : @"NO")
NSLog(@"Is Kind of NSString: %@", NSStringFromBOOL([thing isKindOfClass: [NSString class]]);
I feel that this is more in line with some of Apple's to-string macros (NSStringFromClass, NSStringFromRect, NSStringFromSelector, and so on), and generally pretty simple to use on-the-fly. Just be sure to put that macro somewhere globally accessible, or frequently imported!
我觉得这更符合 Apple 的一些 to-string 宏（NSStringFromClass、NSStringFromRect、NSStringFromSelector等），并且通常非常易于即时使用。只要确保将该宏放在全局可访问或经常导入的地方！
回答by Hot Licks
You print a BOOL like this:
你像这样打印一个 BOOL：
NSLog(@"The BOOL value is %s", theBoolValue ? "YES" : "NO");
Or, with the new @notation, one could do:
或者，使用新的@符号，可以这样做：
NSLog(@"The BOOL value is %@", @(theBoolValue));
回答by Nuoji
NSLog uses a simple printf-style invocation format its text, and your code example is missing the character sequence needed to embed an object.
NSLog 使用简单的 printf 样式调用格式来格式化其文本，而您的代码示例缺少嵌入对象所需的字符序列。
This should work:
这应该有效：
NSLog(@"Is Kind of NSString: %@", ([thing isKindOfClass:[NSString class]]) ? @"YES" : @"NO");
回答by HammerSlavik
First of all you should add a formatting specifier %@.
It should look like this:
首先，您应该添加一个格式说明符%@。它应该是这样的：
NSLog(@"Is Kind of NSString: %@", ([thing isKindOfClass:[NSString class]]) ? @"YES" : @"NO");
Also you can extract a conversion from BOOLto NSStringwith extern function as Apple did with NSStringFromCGRect, NSStringFromClassetc.
您也可以像 Apple 那样使用 extern 函数提取 from BOOLto的转换，等等。NSStringNSStringFromCGRectNSStringFromClass
Create utils file or add to existing ones header the following code:
创建 utils 文件或将以下代码添加到现有的文件头：
//NSString+TypeConversion.h
extern NSString *NSStringFromBOOL(BOOL aBool);
And also add the following code into implementation:
并将以下代码添加到实现中：
//NSString+TypeConversion.m
NSString *NSStringFromBOOL(BOOL aBool)
{
return aBool ? @"YES" : @"NO";
}
So now you can use this function in other places and your code become more clear and reusable:
所以现在你可以在其他地方使用这个函数，你的代码变得更加清晰和可重用：
#import "NSString+TypesConversion.h"
NSLog(@"Is Kind of NSString: %@", NSStringFromBOOL([thing isKindOfClass:[NSString class]]));
回答by user2941395
This is work for me:
这对我来说是工作：
NSLog(@"The BOOL value is %@", theBoolValue ? "YES" : "NO");
