应用程序转换为ARC，现在收到有关我的属性的警告 [英] App converted to ARC, now getting warnings about my properties

问题描述

我刚将我的应用转换为 ARC ，虽然它构建良好，但我得到600条警告，所有这些都与我的属性有关。例如：

I just converted my app to ARC, and while it builds fine, I get like 600 warnings, all pertaining to my properties. Such as:

默认属性'assign'不适合非gc对象

Default property attribute 'assign' not appropriate for non-gc object

未指定'assign'，'retain'或'copy'属性 - 'assign'为
假设

No 'assign', 'retain' or 'copy' attribute is specified - 'assign' is assumed

在Xcode转换我的代码后，这是我的属性：

After Xcode converted my code, here is what my properties look like:

@property (nonatomic) EKEventStore *eventStore;
@property (nonatomic) EKCalendar *defaultCalendar;
@property (nonatomic) UIActionSheet *currentActionSheet;
@property (nonatomic) UILabel *noEventLabel;

有人谈到需要添加 strong 来所有这些。是这样的吗？ Xcode是否忘记添加内容？

Someone talked about needing to add strong to all of these. Is this the case? Did Xcode forget to add something?

推荐答案

ARC是对的。你不能拥有没有内存管理资格;你必须说分配，保留（或强大，这是相同的东西），或弱。

ARC is right. You cannot have no memory-management qualifer; you must say assign, retain (or strong which is the same thing), or weak.

以前，assign是默认值。但这可能不是你想要的，因为它是最糟糕的选择 - 它是一种旧式的非ARC弱引用。您要么需要智能ARC弱引用（当对象不存在时为nil）或强引用（由ARC为您管理内存）。

Previously, assign was the default. But that is probably not what you want, because is it is the worst possible option - it is an old-style non-ARC weak reference. You either want a smart ARC weak reference (goes to nil when the object goes out of existence) or a strong reference (memory-managed for you by ARC).

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