UITextField限制字数

最新推荐文章于 2024-05-22 16:10:35 发布

原创最新推荐文章于 2024-05-22 16:10:35 发布 · 247 阅读

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CC 4.0 BY-SA版权

此代码片段展示了根据输入语言调整标签文本长度的逻辑，适用于中文和特定字符限制场景。

static constNSInteger Max_Character_Num =4;

- (IBAction)onTextFieldEditingChanged:(id)sender
{
    NSString *lang = [[UITextInputMode currentInputMode] primaryLanguage];
    if ([lang isEqualToString:@"zh-Hans"]) {
        UITextRange *selectedRange = [self.tagNameTextField markedTextRange];
        UITextPosition *position = [self.tagNameTextField positionFromPosition:selectedRange.start offset:0];
        if (!position) {
            if (self.tagNameTextField.text.length > Max_Character_Num) {
                self.tagNameTextField.text = [self.tagNameTextField.text substringFrom:0 to:Max_Character_Num];
            }
        }
    }else{
        if (self.tagNameTextField.text.length > Max_Character_Num) {
            self.tagNameTextField.text = [self.tagNameTextField.text substringFrom:0 to:Max_Character_Num];
        }
    }
}