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I put a UIActivityIndicatorView on my storyboard screen and from the storyboard screen I dragged the UIActivityIndicatorView to the .h file of my controller and it created this in my .h file:

@property (weak, nonatomic) IBOutlet UIActivityIndicatorView *spinner;

But when I started working in the .m file, it didn't place the property there automatically, and when I tried to put this in there:

@property (nonatomic, retain) UIActivityIndicatorView *spinner;

which gave the error 

Illigal declaration of property in the continuation class xyz, property must be readWrite...

Does anyone know why this is happening? And how do I fix it? :)

Thanks!

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1 回答 1

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当您在类延续中重新声明一个属性时，更改与其关联的内存限定符是非法的，只能从只读变为读写（反之亦然，尽管我不明白为什么有人想要这样做）。要么移除弱点，要么移除保留的出口，只留下一个。

此外，属性不会“自动”为您“放置”在类中。如果您需要访问对象的属性，点或消息语法就可以正常工作。

于 2012-11-29T02:40:36.147 回答