BOOL to NSString

Question

If I have a method that returns a BOOL, how do I cast that to an NSString so I can print it out in console?

For example, I tried doing this, which isn't working:

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?

Solution 1

Use a ternary operator:

BOOl isKind= [thing isKindOfClass:[NSString class]];

NSLog(@"Is Kind of NSString: %d", isKind);
NSLog(@"Is Kind of NSString: %@", isKind ? @"YES" : @"NO");

Solution 2

In the background BOOL acts like an int type so you can use %i to test for a BOOL type’s value in NSLog:

BOOL a = YES;
BOOL b = NO;
NSLog(@"a is %i and b is %i", a, b);

// Output: a is 1 and b is 0

Solution 3

So, I know that this is really old, but I thought I might as well toss my solution into the ring. I do:

#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!

Solution 4

You print a BOOL like this:

NSLog(@"The BOOL value is %s", theBoolValue ? "YES" : "NO");

Or, with the new @ notation, one could do:

NSLog(@"The BOOL value is %@", @(theBoolValue));

Solution 5

NSLog uses a simple printf-style invocation format its text, and your code example is missing the character sequence needed to embed an object.

This should work:

NSLog(@"Is Kind of NSString: %@", ([thing isKindOfClass:[NSString class]]) ? @"YES" : @"NO");

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