将NSInteger变量传递给NSMutableDictionary或NSMutableArray [英] Passing NSInteger variable to NSMutableDictionary or NSMutableArray

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"]; 

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