xcode iOS：替换数组数组中的对象
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iOS: replace an object inside an array of array
提问by cyclingIsBetter
My code is:
我的代码是：
[[arrayOne objectAtIndex:indexSelected] replaceObjectAtIndex:1 withObject:new];
NSLog(@"indexSelected:%d", indexSelected); // = 0
NSLog(@"new:%@", new); // = 26
indexSelectedis an int and newis a string
indexSelected是一个 int 并且new是一个字符串
When I try to do this I have an exception that says: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI replaceObjectAtIndex:withObject:]: unrecognized selector sent to instance 0x1cee60'
当我尝试这样做时，我有一个例外： Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI replaceObjectAtIndex:withObject:]: unrecognized selector sent to instance 0x1cee60'
Why?
为什么？
回答by Joshua Smith
This is because NSArray is immutable. Use an NSMutableArray.
这是因为 NSArray 是不可变的。使用 NSMutableArray。
