Clang提供的办法

1 #pragma clang diagnostic push
2 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
3         result = [self sizeWithFont:font constrainedToSize:size lineBreakMode:lineBreakMode];
4 #pragma clang diagnostic pop

1 #pragma clang diagnostic push
2 #pragma clang diagnostic ignored "-Wunused-variable"
3     int num;
4 #pragma clang diagnostic pop

num = 9;
NSLog(@"num=%d", num);