@synthesize window = _window;//指明实例变量的名称,这个名称用来存储指针。(程序内部最终是用这个名称来做内存释放的,例如:[_window release])
内部合成器方法如下:
-(UIWindow *) window{
return _window;
}
-(void) setWindow:(UIWindow *)window{
_window = window;
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