ios-Text inset for UITextField
http://stackoverflow.com/questions/2694411/text-inset-for-uitextfield
myTextField.layer.sublayerTransform = CATransform3DMakeTranslation(5, 0, 0);
占位符和输入的字符离边框的距离调整
http://stackoverflow.com/questions/2694411/text-inset-for-uitextfield
myTextField.layer.sublayerTransform = CATransform3DMakeTranslation(5, 0, 0);
占位符和输入的字符离边框的距离调整