布尔值只是整数，它们只是类型转换的值，比如……

typedef signed char     BOOL; 

#define YES (BOOL)1
#define NO (BOOL)0

BOOL value = YES; 
NSLog(@"Bool value: %d",value);

如果输出为1，则为YES，否则为NO

NSArray *array1 = [NSArray arrayWithObjects:@"todd1", @"todd2", @"todd3", nil];
bool objectMembership = [array1 containsObject:@"todd1"];
NSLog(@"%d",objectMembership);  // prints 1 or 0

//assuming b is BOOL. ternary operator helps us in any language.
NSLog(@"result is :%@",((b==YES)?@"YES":@"NO"));

你可以这样做:

BOOL flag = NO;
NSLog(flag ? @"YES" : @"NO");

在Swift中，你可以简单地打印一个布尔值，它将显示为true或false。

let flag = true
print(flag) //true

直接将bool值打印为整数

BOOL curBool = FALSE;
NSLog(@"curBool=%d", curBool);

- > curBool = 0

将bool类型转换为字符串

char* boolToStr(bool curBool){
    return curBool ? "True": "False";
}

BOOL curBool = FALSE;
NSLog(@"curBool=%s", boolToStr(curBool));

- > curBool =虚假