//APPHelper.h

@interfaceAPPHelper

+ (APPHelper*)call;

- (void) configureWindow:(UIWindow*)window;

@property(nonatomic,readonly) AppDelegate *delegate;

@property(strong,readonly)UIWindow*window;

@end

//APPHelper.m

@interfaceAPPHelper()

@end

@implementationAPPHelper

- (id)init

{

self= [superinit];

if(self) {

_delegate = (GGAppDelegate*)[UIApplicationsharedApplication].delegate;

}

returnself;

}

+ (APPHelper *)call

{

staticdispatch_once_tonceQueue;

staticAPPHelper *appInstance;

dispatch_once(&onceQueue, ^{

appInstance = [[APPHelper alloc] init];

});

returnappInstance;

}

- (UIWindow*)window

{

returnself.delegate.window;

}

- (void)configureWindow:(UIWindow*)window

{

UINavigationController*nav = [[UINavigationControlleralloc] init];

...

...

...

window.rootViewController= nav;

}

@end

在预编译头＊.pch中加入

＃import "AppHelper.h"

#define APP ([APPHelper call])

就可以在任意地方使用

如：APP.window.layer.cornerRadius = 5.0f;

       APP.window.layer.masksToBounds = YES;