使用OBJECT-C来模仿IPHONE的屏幕密码解锁～-use the objc-c to mark the screen lock

介绍： 实现动态UILabel文字的效果，高仿iPhone锁屏时的 “Slide to unlock”效果，即有光照滑过UILabel的文字。仅支持ARC。-Introduction: UILabel dynamic text effects, high imitation iPhone lock screen when the "Slide to unlock" effect, that there is light glide UILabel text. Only supports ARC.