/*
*退出当前应用程序
*/
+ (void)exitApp;
+ (void)exitApp{
UIWindow *window = [[UIApplication sharedApplication].delegate window];
//添加动画
[UIView animateWithDuration:2.0f animations:^{
window.alpha = 0;
} completion:^(BOOL finished){
if (finished){
//exit(0):为0时正常运行程序并推出，非0时非正常运行导致程序退出。
exit(0);
}
}];
}
退出当前应用程序
原文：http://www.cnblogs.com/iQingYang/p/6688379.html
