IBOutlet造成的内存泄漏

在iphone中，只要控件使用IBOutlet连接 ，则必须release它。无论它是否有

@property(nonatomic,assign)，

@property(nonatomic,retain)

属性。

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.

补充：控件一般不会用assign属性！！！

所以无论写没写property属性（retain），均会ratain。