小编ewc*_*wcy的帖子

考虑一下这段代码:

@implementation MyClass
-(void)dealloc {
    NSLog(@"MyClass dealloc: %@", self);
}
@end

@implementation AppDelegate

__weak static MyClass *weakShared = nil;

- (MyClass *)getMyClass {
    MyClass *tmpHolder = [[MyClass alloc] init]; // PREPEND "__autoreleasing"
    weakShared = tmpHolder;
    return weakShared; // ATTENTION TO THIS LINE
}
- (void)logMyClass:(NSUInteger)i {
    MyClass *mc = [self getMyClass];
    NSLog(@"(%@) this is MyClass: %@", @(i), mc);
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    @autoreleasepool {
        for (int i = 0; i < 10; i++) {
            [self logMyClass:i];
        }
        NSLog(@"end");
    } …