OC 常用类 --- NSNumber

1.. 将基本数据类型转化为 OC 的 NSNumber 数值对象

char num1 = 'a';NSNumber *newNum1 = [NSNumber numberWithChar:num1];int num2 = 10;NSNumber *newNum2 = [NSNumber numberWithInt:num2];BOOL num3 = YES;NSNumber *newNum3 = [NSNumber numberWithInt:num3];

2.. 将 OC 的 NSNumber 对象转化为基本数据类型

NSNumber *num1 = @(110);int cNum1 = [num1 intValue];NSNumber *num2 = @(20.20);float cNum2 = [num2 floatValue];

3.. 比较

NSNumber *number = @101;NSNumber *number2 = @100;NSComparisonResult isresult = [number compare:number2];