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(textFieldNotifitionAction:) 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

NSNotificationCenter.defaultCenter().addObserver(self, selector: "textViewNotifitionAction:", name: UITextViewTextDidChangeNotification, object: nil); NSNotificationCenter.defaultCenter().addObserver(self, selector: "textFiledNotifitionAction:", name: UITextFieldTextDidChangeNotification, 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; } }

转载于:https://www.cnblogs.com/zxh-iOS/p/5902743.html

相关资源：swift-一行代码解决UITextFiled和UITextView限制字数和输入特殊字符