Objective C：如何解决“发送到实例的无法识别的选择器”问题错误
我尝试使用以下代码访问实例对象的属性
for (User *user in likersArray)
{
//Set variables for dictionary
NSString *nameLength = [NSString stringWithFormat:@"%i",[user.nickname length]];
}
但是，我不断收到以下错误：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString nickname]: unrecognized selector sent to instance 0x8c0f780'
我的用户类定义如下
@interface User : NSObject <NSCoding>
{
NSString *uid;
NSString *name;
NSString *nickname;
}
@property (nonatomic, copy) NSString *uid;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *nickname;
@end
I am trying to access a property of instance object using the following code
for (User *user in likersArray)
{
//Set variables for dictionary
NSString *nameLength = [NSString stringWithFormat:@"%i",[user.nickname length]];
}
However, I keep getting the following error:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString nickname]: unrecognized selector sent to instance 0x8c0f780'
My user class is defined as below
@interface User : NSObject <NSCoding>
{
NSString *uid;
NSString *name;
NSString *nickname;
}
@property (nonatomic, copy) NSString *uid;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *nickname;
@end
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这也可能意味着
likersArray中的一个User对象被过度释放，并且您遇到了垃圾。It could also mean that one of the
Userobjects inlikersArrayis being over-released and you are hitting garbage.我遇到了一个非常类似的问题，这是由于只创建了一项并将其插入数组而引起的。如果您的 likersArray 仅包含 1 个项目，它也会导致此错误，并且这是一个很难找到的错误。希望这对某人有帮助！
I had a very similar issue which was being caused due to only one item being created and inserted into the array. If your likersArray contains only 1 item it causes this error as well and it's a nasty bug to find. Hopefully this helps someone!
该错误意味着并非
likersArray中的所有内容都是User对象。其中至少有一个东西是一个NSString。That error means that not everything in your
likersArrayis aUserobject. At least one thing in there is anNSString.