支持iOS搜狗输入法和自动关联表情（如输入hehe，出来的表情）
注意：Swift的textView.text != disable_emoji(textView.text)
在OC里面用 ![xxx isEqualString:bbb]
转帖保留（谢谢）：http://www.cnblogs.com/Leetvin/p/4384141.html
@IBOutlet weak var tf: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tf.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func textViewDidChange(textView: UITextView) {
var textTange = textView.selectedTextRange
if(textView.text != disable_emoji(textView.text))
{
textView.text = disable_emoji(textView.text)
}
textView.selectedTextRange = textTange
}
func textFieldDidChange(textField: UITextField) {
var textTange = textField.selectedTextRange
if(textField.text != disable_emoji(textField.text))
{
textField.text = disable_emoji(textField.text)
}
textField.selectedTextRange = textTange
}
func disable_emoji(text:String)->String
{
var regex = NSRegularExpression(pattern: "[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201f ]", options: NSRegularExpressionOptions.CaseInsensitive, error: nil)
var modifiedString = regex!.stringByReplacingMatchesInString(text, options: NSMatchingOptions(), range: NSMakeRange(0, text.utf16Count), withTemplate: "")
return modifiedString
}