NSNumber生成:NSNumber *number1 = [[NSNumber alloc] initWithInt:1000];转成NSNumber型:// short型→NSNumber型NSNumber *num = [NSNumber numberWithShort:32767];// int型→NSNumber型NSNumber *num = [NSNumber numberWithInt:2147483647];// long型→NSNumber型NSNumber *num = [NSNumber numberWithLong:2147483647];// float型→NSNumber型NSNumber *num = [NSNumber numberWithFloat:42.195f];// double型→NSNumber型NSNumber *num = [NSNumber numberWithDouble:3.1415f];// BOOL型→NSNumber型NSNumber *num = [NSNumber numberWithBool:YES];// char型→NSNumber型NSNumber *num = [NSNumber numberWithChar:a];NSNumber型转为NSString型:(同理，short/int/long/float/bool/char Value)NSString *str = [num stringValue];NSNumber型是否相同的比较:BOOL b = [num1 isEqualToNumber:num2];