Objective-c - Real device test NSProgress does not print progress

Question

progress:^(NSProgress * _Nonnull uploadProgress) {
NSLog(@"Progress - %f", uploadProgress.fractionCompleted);
}

During the real machine test, this log cannot be printed, but it works fine on the simulator. The break point in this block will not stop. Why?

Answer 1

A common reason for this situation is redefining NSLog.
Please check if there is code similar to the one below in your project.

#ifdef DEBUG
#define NSLog(format, ...) do {                                                                          \
fprintf(stderr, "<%s : %d> %s\n",                                           \
[[[NSString stringWithUTF8String:__FILE__] lastPathComponent] UTF8String],  \
__LINE__, __func__);                                                        \
(NSLog)( (format), ## __VA_ARGS__ );                                           \
fprintf(stderr, "-------\n");                                               \
} while (0)
#else
#   define NSLog(...)
#endif