Block makes a point of attention

Block makes a point of attention

After iOS launches block, Apple is highly recommended for developers. However, memory problems may occur.

You can add the following macros:

#ifndef weakify#if__has_feature (OBJC_ARC)#defineWeakify (x) \_pragma ("clang Diagnostic Push") _pragma ("clang diagnostic ignored \ "-wshadow\"") autoreleasepool{} __weak __typeof__ (x) __weak_# #x # #__=x; _pragma ("clang Diagnostic Pop")#else#defineWeakify (x) \_pragma ("clang Diagnostic Push") _pragma ("clang diagnostic ignored \ "-wshadow\"") autoreleasepool{} __block __typeof__ (x) __block_# #x # #__=x; _pragma ("clang Diagnostic Pop")#endif#endif#ifndef strongify#if__has_feature (OBJC_ARC)#defineStrongify (x) \_pragma ("clang Diagnostic Push") _pragma ("clang diagnostic ignored \ "-wshadow\"") Try{}@finally{} __typeof__ (x) x =__weak_# #x # #__; _pragma ("clang Diagnostic Pop")#else#defineStrongify (x) \_pragma ("clang Diagnostic Push") _pragma ("clang diagnostic ignored \ "-wshadow\"") Try{}@finally{} __typeof__ (x) x =__block_# #x # #__; _pragma ("clang Diagnostic Pop")#endif#endif

When used:

    @weakify (self);     = ^{        @strongify (self);        NSLog (@ "aviewcontrolleraviewcontroller%@", self);    };

Block makes a point of attention