ios 如何在 NSLog 中打印布尔标志？
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How to print Boolean flag in NSLog?
提问by Devang
Is there a way to print value of Boolean flag in NSLog?
有没有办法在 NSLog 中打印布尔标志的值？
回答by BoltClock
Here's how I do it:
这是我的方法：
BOOL flag = YES;
NSLog(flag ? @"Yes" : @"No");
?:is the ternary conditional operator of the form:
?:是以下形式的三元条件运算符：
condition ? result_if_true : result_if_false
Substitute actual log strings accordingly where appropriate.
在适当的地方相应地替换实际的日志字符串。
回答by SashaQbl
%d, 0is FALSE, 1is TRUE.
%d, 0为假，1为真。
BOOL b;
NSLog(@"Bool value: %d",b);
or
或者
NSLog(@"bool %s", b ? "true" : "false");
On the bases of data type %@changes as follows
根据数据类型%@变化如下
For Strings you use %@
For int you use %i
For float and double you use %f
回答by Chandan Shetty SP
Booleans are nothing but integers only, they are just type casted values like...
布尔值只是整数，它们只是类型转换的值，例如...
typedef signed char BOOL;
#define YES (BOOL)1
#define NO (BOOL)0
BOOL value = YES;
NSLog(@"Bool value: %d",value);
If output is 1,YES otherwise NO
如果输出为 1，则为 YES 否则为 NO
回答by arcticmatt
Note that in Swift, you can just do
请注意，在 Swift 中，您可以这样做
let testBool: Bool = true
NSLog("testBool = %@", testBool.description)
This will log testBool = true
这将记录 testBool = true
回答by xizor
While this is not a direct answer to Devang's question I believe that the below macro can be very helpful to people looking to log BOOLs. This will log out the value of the bool as well as automatically labeling it with the name of the variable.
虽然这不是 Devang 问题的直接答案，但我相信下面的宏对希望记录 BOOL 的人非常有帮助。这将注销 bool 的值，并自动用变量的名称标记它。
#define LogBool(BOOLVARIABLE) NSLog(@"%s: %@",#BOOLVARIABLE, BOOLVARIABLE ? @"YES" : @"NO" )
BOOL success = NO;
LogBool(success); // Prints out 'success: NO' to the console
success = YES;
LogBool(success); // Prints out 'success: YES' to the console
回答by green_knight
Apple's FixIt supplied %hhd, which correctly gave me the value of my BOOL.
Apple 的 FixIt 提供了 %hhd，它正确地给了我 BOOL 的值。
回答by user3182143
We can check by Four ways
我们可以通过四种方式检查
The first way is
第一种方式是
BOOL flagWayOne = TRUE;
NSLog(@"The flagWayOne result is - %@",flagWayOne ? @"TRUE":@"FALSE");
The second way is
第二种方式是
BOOL flagWayTwo = YES;
NSLog(@"The flagWayTwo result is - %@",flagWayTwo ? @"YES":@"NO");
The third way is
第三种方式是
BOOL flagWayThree = 1;
NSLog(@"The flagWayThree result is - %d",flagWayThree ? 1:0);
The fourth way is
第四种方式是
BOOL flagWayFour = FALSE; // You can set YES or NO here.Because TRUE = YES,FALSE = NO and also 1 is equal to YES,TRUE and 0 is equal to FALSE,NO whatever you want set here.
NSLog(@"The flagWayFour result is - %s",flagWayFour ? YES:NO);
回答by Tamás Sengel
In Swift, you can simply print a boolean value and it will be displayed as trueor false.
在 Swift 中，你可以简单地打印一个布尔值，它会显示为trueor false。
let flag = true
print(flag) //true
回答by Saqib R.
NSArray *array1 = [NSArray arrayWithObjects:@"todd1", @"todd2", @"todd3", nil];
bool objectMembership = [array1 containsObject:@"todd1"];
NSLog(@"%d",objectMembership); // prints 1 or 0
回答by SAQIB SOHAIL BHATTI
Here is how you can do it:
您可以这样做：
BOOL flag = NO;
NSLog(flag ? @"YES" : @"NO");
