学习贝塞尔曲线及层动画相关
学习贝塞尔曲线及层动画相关
CALayer精讲对应的demo
学习CATransition动画demo
一些正则校验，判断邮箱，手机号码，车牌号，身份证号，网址，账号，密码，ip，去掉html格式，工商税号等。
用绘制的方式来实现简单的弹幕效果及自定义表情键盘和系统键盘之间的切换,实现实时发送弹幕的内容
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