IBOutlet造成的內存泄漏

在iphone中，只要控件使用IBOutlet連接 ，則必須release它。無論它是否有

@property(nonatomic,assign)，

@property(nonatomic,retain)

屬性。

原因如下：

On Mac OS X, IBOutlets are connected like this:

1. Look for a method called set<OutletName>:. If it exists call it.
2. If no method exists, look for an instance variable named <OutletName>, set it without retaining.

On iPhone OS, IBOutlets are connected like this:

1. call [object setValue:outletValue forKey:@"<OutletName>"]

The behavior of set value for key is to do something like this:

1. Look for a method called set<OutletName>:. If it exists call it.
2. If no method exists, look for an instance variable named , set it and retain it.

補充：控件一般不會用assign屬性！！！

所以無論寫沒寫property屬性（retain），均會ratain。