How to use Ios-nslog

Definition of NSLog

NSLog is defined in NSObjCRuntime.h as follows:

void NSLog (NSString *format, ...);

Basically, NSLog is much like printf, which also outputs the results in the console. The difference is that the formatted character passed in is a NSString object, not a string pointer such as Chat *.

Example

NSLog can be used in the following ways:

NSLog (@ "This is a Test");

NSLog (@ "string is:%@", string);

NSLog (@ "x=%d, y=%d", 10, 20);

But the following wording is not possible:

int i = 12345;

NSLog (@ "%@", I);

The reason is that%@ needs to display objects, and int i is obviously not an object, to be displayed correctly, write:

int i = 12345;

NSLog (@ "%d", I);

Format

The format of the NSLog is as follows:

• %@ Object
• %d,%i integer
• %u no-character shaping
• %f floating point/double word
• %x,%x binary integer
• %o Eight-binary integers
• %zu size_t
• %p pointer
• %e floating point/double word (scientific calculation)
• %g floating point/double word
• %s C string
• %.*s Pascal String
• %c character
• %c Unichar
• %LLD 64-bit long integer
• %llu 64-bit long integer without character
• %LF 64-bit double word

How to use Ios-nslog