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iOS UITextField限制字数

iOS UITextField限制字数

作者: 诠释残缺 | 来源:发表于2018-01-31 14:08 被阅读10次
        NSInteger length = 15;
        
        NSString *toBeString = textfield.text;
        NSString *lang = [[UIApplication sharedApplication]textInputMode].primaryLanguage; // 键盘输入模
        if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入,包括简体拼音,健体五笔,简体手写
            UITextRange *selectedRange = [textfield markedTextRange];
            //获取高亮部分
            UITextPosition *position = [textfield positionFromPosition:selectedRange.start offset:0];
            // 没有高亮选择的字,则对已输入的文字进行字数统计和限制
            if (!position) {
                if (toBeString.length > length){
                    NSRange rangeIndex = [toBeString rangeOfComposedCharacterSequenceAtIndex:length];
                    if (rangeIndex.length == 1){
                        textfield.text = [toBeString substringToIndex:length];
                    }
                    else{
                        NSRange rangeRange = [toBeString rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, length)];
                        textfield.text = [toBeString substringWithRange:rangeRange];
                    }
                }
            }
        } else{ // 中文输入法以外的直接对其统计限制即可,不考虑其他语种情况
            if (toBeString.length > length){
                NSRange rangeIndex = [toBeString rangeOfComposedCharacterSequenceAtIndex:length];
                if (rangeIndex.length == 1){
                    textfield.text = [toBeString substringToIndex:length];
                }else{
                    NSRange rangeRange = [toBeString rangeOfComposedCharacterSequencesForRange:NSMakeRange(0,length)];
                    textfield.text = [toBeString substringWithRange:rangeRange];
                }
            }
        }
    
    
    

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