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:
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).
这篇关于应用程序转换为ARC，现在收到有关我的属性的警告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！