仿写工商银行的安全键盘，另外实现点击键盘放大显示的动画效果。
仿写工商银行的安全键盘，另外实现点击键盘放大显示的动画效果。
◉数字键盘使用随机数字
◉记住用户名，登录时省去重新输入用户名繁琐
◉点击头像，放大显示
◉点击头像编辑按钮，可以从相机或者相册选择照片并进行保存
◉自定义Alert弹出框
◉明暗文密码切换
◉textField placeholder左右抖动
◉点击键盘按钮，文字放大显示动画
◉按下字母，字符按键时放大显示文字
◉点击键盘按钮，放大显示动画
[简书地址] ( http://www.jianshu.com/p/df4d57bcd2b8 )
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