目标C中的弱属性

Question

我有两个弱的属性，声明如下：

@property (nonatomic, weak) NSString *weakProperty;
@property (nonatomic, weak) NSMutableString *weakMutableProperty;

- (void)testNonMutable
{
    NSString *name = @"ABC";
    self.weakProperty = name;    
    name = nil;

    NSLog(@"Printing weak property %@",self.weakProperty);
}

- (void)testMutable
{
     NSMutableString *name = [NSMutableString stringWithString:@"ABC"];
     self.weakMutableProperty = name;
     name = nil;

     NSLog(@"Mutable : Printing weak property %@",self.weakMutableProperty);
}

我期待NSLog语句打印nil，但它在第一种方法中打印ABC。但它确实在第二种方法中。 有人可以帮助我吗？