仪器显示假漏？ [英] Instruments showing false leak?

问题描述

我不知道为什么仪器显示以下代码泄漏128字节在UILabel initWithFrame行：

  self。 navigationItem.leftBarButtonItem = self.editButtonItem; 
 UILabel * tmp = [[UILabel alloc] initWithFrame：CGRectMake（25，100，275，100）]; 
 self.emptyMsg = tmp; 
 [tmp release];请注意，在这个类中释放下面的emptyMsg属性：
 
 
 b 
 
   - （void）dealloc {
 [self.emptyMsg release] 
 [self.pathToUsersFriendsFile release]; 
 [super dealloc]; 
} 
  
有一点我没有使用访问器方法来设置emptyMsg，所以我期望改变使这种泄漏消失。唉，它仍然出现。 
 
 
 
变量声明：
  @interface FriendListViewController：UITableViewController< AddFriendDelegate> {
 NSString * pathToUsersFriendsFile; 
 UILabel * blankMsg; 
} 
 @property（retain）UILabel * emptyMsg; 
 @end 
  
 
 
解决方案
方式你做到了。 （虽然我会采取Rich的意见，并且不使用 dealloc 方法中的点语法;然后释放实例变量。）仪器不应该困惑它，但仪器不是完美的。如果坚持这是一个内存泄漏，这是一个假阳性。
 
I am not sure why Instruments is showing the following code as leaking 128 bytes on the UILabel initWithFrame line:
self.navigationItem.leftBarButtonItem = self.editButtonItem; 
UILabel *tmp = [[UILabel alloc] initWithFrame:CGRectMake(25, 100, 275, 100)];
self.emptyMsg = tmp;
[tmp release];
Note that in this classes is releasing the emptyMsg property in the following:
-(void) dealloc {
     [self.emptyMsg release];
     [self.pathToUsersFriendsFile release];
     [super dealloc];
}
At one point I wasn't using the accessor method to set emptyMsg so I expected that change to the make this leak go away.  Alas, it is still showing up.  Can some one point me to another  cause?

Declaration of variable:
@interface FriendListViewController : UITableViewController <AddFriendDelegate> {
    NSString *pathToUsersFriendsFile;
    UILabel *emptyMsg;
}
@property(retain) UILabel *emptyMsg;
@end

解决方案
There's nothing wrong with the way you've done it. (Although I would take Rich's advice and not use the dot syntax in the dealloc method; release the instance variables instead.) Instruments shouldn't be confused by it, but Instruments is not perfect. If it is insisting that's a memory leak, it's a false positive.

                        
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