NSDate ivar 成为<不是Objective-C对象>? [英] NSDate ivar become <not an Objective-C object>?

问题描述

- (id)initWithCoder:(NSCoder *)aDecoder
{
   dueDate = [NSDate date];

}

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
    [formatter setDateStyle:NSDateFormatterShortStyle];
    [formatter setTimeStyle:NSDateFormatterShortStyle];
    self.lbDueDate.text = [formatter stringFromDate:dueDate];
}

在 init 方法中，我声明了 DueDate = [NSDate date].但是当我调试时，在这一行

In init method I declared dueDate = [NSDate date]. But when I debug, at this line

    self.lbDueDate.text = [formatter stringFromDate:dueDate];

并输出:(NSDate *) DueDate = 0x0c497390那么发生了什么?

And Output: (NSDate *) dueDate = 0x0c497390 So what happend ?

推荐答案

这意味着对象已经被-dealloced(除非它是nil).因此，在运行静态分析器并检查您的代码之后，与 Zombies 一起运行并更频繁地向它发送消息.

It means the object's been -dealloced (unless it is nil). So run with Zombies and message it more often -- after running the static analyzer and reviewing your code.

源码中的一个问题:dueDate = [NSDate date]; 应该是dueDate = [[NSDate date] copy];.另一个问题是，您没有在 -initWithCoder: 的实现中通过超类的指定初始值设定项进行调用.

one problem in the source: dueDate = [NSDate date]; should be dueDate = [[NSDate date] copy];. another problem is that you don't call through the superclass' designated initializer in your implementation of -initWithCoder:.

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