objective-c - 使用ARC时，对Objective-C对象而不是结构使用什么？

arc禁止在structs或unions中使用objective-c对象。
除非您添加__unsafe_unretained这意味着它不受管理。
我想知道现在人们用什么来代替“抄送”？
还是手动保存？

最佳答案

我将在一个objc对象中管理不同的对象，如下所示：

@class MyFirst, MySecond;

@interface MyContainer : NSObject

@property (nonatomic, strong, readonly) MyFirst *firstInst;
@property (nonatomic, strong, readonly) MySecond *secondInst;

// optional: convenience initializer
+ (instancetype)containerWithFirstInst:(MyFirst *)firstInst secondInst:(MySecond *)secondInst;

@end

// required by linker: stub definition for the class declared above
@implementation MyContainer
@end


@interface SomeController : NSObject

- (void)doSomething;

@end

@implementation SomeController

- (void)doSomething {
    MyFirst *firstInstance = [[MyFirst alloc] initWithSomeParameters:...];
    MySecond *secondInstance = [[MySecond alloc] initWithSomeParameters:...];
    MyContainer *container = [MyContainer containerWithFirstInst:firstInstance secondInst:secondInstance];
    // use container as a struct (but it's definitely an object that is managed by ARC)
}

@end