NSNumber NScopy

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];

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