在初始化方法中设置块的适当方法是什么？

Question

Apple建议“不要在初始化方法和dealloc中使用访问器方法”与本文档： https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmPractical.html

如果我想在初始化方法中设置块，阻止对属性的引用，我如何编写更好的代码？

typedef void(^customBlock)();

@interface CustomObject : NSObject
@property (nonatomic, strong) NSString *string;
@property (nonatomic, copy) customBlock customBlock1;
@property (nonatomic, copy) customBlock customBlock2;
@end

@implementation CustomObject

- (instancetype)init {
    self = [super init];
    if (self) {
        __weak __typeof(self) weakSelf = self;

        _customBlock1 = ^ {
            __typeof(self) strongSelf = weakSelf;
            strongSelf -> _string = @"string by iVar";
        };

        _customBlock2 = ^{
            weakSelf.string = @"string by accessor";
        };
    }
    return self;
}

@end

Answer 1

_customBlock1 =[ ^ {
        __typeof(self) strongSelf = weakSelf;
        strongSelf -> _string = @"string by iVar";
    } copy];

这可以达到调用setter方法的效果，因此避免了在Initializer方法中使用accessor方法的副作用。