xCode 6如何修复“未声明的标识符的使用”用于自动属性合成？ [英] xCode 6 how to fix "Use of undeclared identifier" for automatic property synthesis?

问题描述

我使用xCode6 Beta 3，并且遇到一个问题，其中以前编译好的代码（xCode 5.1.1或xCode6 beta 2）突然开始给我使用未声明的标识符错误：

I'm using xCode6 Beta 3, and am running into an issue where a code which previously compiled fine (xCode 5.1.1 or xCode6 beta 2) suddenly started to give me "Use of undeclared identifier" errors when accessing an automatically synthesized instance variable:

- (void)setFinished:(BOOL)finished {
    [self willChangeValueForKey:@"isFinished"];
    _finished = finished;
    [self didChangeValueForKey:@"isFinished"];
}

//ERROR:
 Use of undeclared identifier '_finished'; did you mean 'finished'?

添加 @synthesize finished = _finished; 错误消失了，但是否有办法强制xCode6 Beta 3使用自动属性合成使用下划线符号？

推荐答案

起初我以为这是一个测试版本的错误，但今天我看到这种类型的错误发生在XCode 6转基因种子也，虽然我还没有发现在哪些特定的情况下。

At first I thought it was a beta version bug, but today I saw that this type of errors occur on the XCode 6 GM Seed also, though I'm yet to discover in which particular cases.

无论如何，修复是在@implementation块中添加一个synthesize语句，显式声明ivar的名称以及属性：

Anyway, the fix is to add a synthesize statement in the @implementation block, explicitly declaring the name of the ivar as well as the property:

@synthesize property = _property

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