r变量传递给NSMutableDictionary或NSMuta

r变量传递给NSMutableDictionary或NSMuta

本文介绍了将NSInteger变量传递给NSMutableDictionary或NSMutableArray的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

为什么这不起作用:

NSInteger temp = 20;
[userSettingsFromFile setObject:temp forKey:@"aTemp"];

但是这样做:

[userSettingsFromFile setObject:@"someObject" forKey:@"aTemp"];

如何使用NSInteger变量?

推荐答案

NSInteger不是对象,它只是类型转换为32位的int或64位的long.由于NSDictionary只能存储对象,因此需要先将整数包装到对象中,然后才能存储它.试试这个:

NSInteger isn't an object -- it's simply typecast to int on 32-bit or long on 64-bit. Since NSDictionary can only store objects, you need to wrap the integer into an object before you can store it. Try this:

NSInteger temp = 20;
[userSettingsFromFile setObject:[NSNumber numberWithInteger:temp]
                         forKey:@"aTemp"];

这篇关于将NSInteger变量传递给NSMutableDictionary或NSMutableArray的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-14 15:38