OC中限制字数的方法
我是用通知实现的，首先添加UITextFiled和UITextView的接收中心
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textViewNotifitionAction:) name:UITextViewTextDidChangeNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFiledNotifitionAction:) name: UITextFieldTextDidChangeNotification object:nil];
通知调用的方法
- (void)textViewNotifitionAction:(NSNotification *)userInfo{
if (_textV.text.length>=10) {
NSString *str = [_textV.text substringToIndex:10];
_textV.text = str;
}
}
- (void)textFieldNotifitionAction:(NSNotification *)userInfo{
if (_textF.text.length>=10) {
NSString *str = [_textF.text substringToIndex:10];
_textF.text = str;
}
}
Swift中限制字数的方法
设置接收中心
NotificationCenter.default.addObserver(self, selector: #selector(textViewNotifitionAction), name: NSNotification.Name.UITextViewTextDidChange, object: nil);
NotificationCenter.default.addObserver(self, selector: #selector(textFiledNotifitionAction), name: NSNotification.Name.UITextFieldTextDidChange, object: nil);
通知调用的方法
func textViewNotifitionAction(userInfo:NSNotification){
let textVStr = textV.text as NSString;
if (textVStr.length >= 10) {
let str = textVStr.substringToIndex(10);
textV.text = str;
}
}
func textFiledNotifitionAction(userInfo:NSNotification){
let textFStr = textF.text! as NSString;
if (textFStr.length >= 10) {
let str = textFStr.substringToIndex(10);
textF.text = str;
}
}
