数字对象NSNumber

 

//将int类型转化成对象
int number = 9527;
NSNumber *numberString = [NSNumber numberWithInt:number];
//对象是可以放入数组的
NSArray *array = [NSArray arrayWithObject:numberString];
//转回来
int number2 = [numberString intValue];
        
//字符串转整型
NSString *string3 = @"9527";
int number3 = [string3 intValue];
//整型转字符串
int number4 = 7180;
NSString *string4 = [NSString stringWithFormat:@"%d",number4];