在 Xcode 6 中关闭指定初始值设定项检查

Turn off designated initializer checking in Xcode 6

提问by Clay Bridges

I'm getting the compile error:

我收到编译错误：

error: convenience initializer missing a 'self' call to another initializer [-Werror,-Wobjc-designated-initializers]

Compile-checked designated initializers might be a good thing, but if I don't want deal with that right now, how can I turn this off?

编译检查指定初始值设定项可能是一件好事，但如果我现在不想处理它，我该如何关闭它？

回答by bandejapaisa

Following on from Clay's answer..

继克莱的回答之后..

Method 3

方法三

You might want to suppress the warning on one occurrence, not all of them:

您可能希望在一次而不是所有情况下取消警告：

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wobjc-designated-initializers"
- (instancetype) initWithCoder:(NSCoder *)coder {
    self = [super initWithCoder:coder];
    if (self) {
        // do whatever I was doing....
    }
    return self;
}
#pragma clang diagnostic pop

EDIT: However, I've only actually used this once myself. I find it the same amount (or a little more) effort just to do it properly if it's a single case. So flag up your constructor with NS_DESIGNATED_INITIALIZER. And if it then complains about the init method not being overridden add an init method to your header with NS_UNAVAILABLE.

编辑：但是，我自己实际上只使用过一次。如果它是一个单独的案例，我发现它只是为了正确地做到这一点而付出了同样多（或更多）的努力。所以用 NS_DESIGNATED_INITIALIZER 标记你的构造函数。如果它然后抱怨 init 方法没有被覆盖，请使用 NS_UNAVAILABLE 在您的标头中添加一个 init 方法。

回答by Clay Bridges

Method 1

方法一

In your project:

在您的项目中：

1. Edit the build settings for your target (?-1, select project, or cf. Apple docs).
2. Search for "Other warning flags".
3. Add -Wno-objc-designated-initializers.

1. 编辑目标的构建设置（？-1，选择项目，或参见Apple 文档）。
2. 搜索“其他警告标志”。
3. 添加-Wno-objc-designated-initializers.

You can also do some combination of this and -Wobjc-designated-initializerson a per file basis or with clang diagnostic pushes and pops (cf. @bandejapaisa's "Method 3" answerbelow).

您还可以-Wobjc-designated-initializers在每个文件的基础上或使用 clang 诊断推送和弹出来执行此操作的一些组合（参见下面@bandejapaisa 的“方法 3”答案）。

Method 2

方法二

This method allows you to switch back and forth between Xcode 5 & 6, and also provides you a reminder to fix the designated initializer stuff.

此方法允许您在 Xcode 5 和 6 之间来回切换，并提醒您修复指定的初始化程序。

For iOS development, put this in your .pch(precompiled header) file:

对于 iOS 开发，把它放在你的.pch（预编译头）文件中：

#ifdef __IPHONE_8_0
    // suppress these errors until we are ready to handle them
    #pragma message "Ignoring designated initializer warnings"
    #pragma clang diagnostic ignored "-Wobjc-designated-initializers"
#else
    // temporarily define an empty NS_DESIGNATED_INITIALIZER so we can use now,
    // will be ready for iOS8 SDK
    #define NS_DESIGNATED_INITIALIZER
#endif

The analogto __IPHONE_8_0for OS X 10.10 is __MAC_10_10.

该模拟到__IPHONE_8_0为OS X 10.10是__MAC_10_10。

Why?

为什么？

If you are interested in why these messages exist, you can check out this SO answeror these Apple docs.

如果您对这些消息存在的原因感兴趣，可以查看此 SO 答案或这些Apple 文档。