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  • UITextView实现限制100字

    placeHoderLable = [[UILabel alloc]initWithFrame:CGRectMake(3, 3, DeviceWidth-6, 40)];

    //根据情况调节位置 placeHoderLable.enabled = NO;

    placeHoderLable.text = @"请在这里输入您要的内容,您的预言需要经过其他用户的才能发布。";

    placeHoderLable.numberOfLines=0;

    placeHoderLable.font = [UIFont systemFontOfSize:12];

    placeHoderLable.textColor = [UIColor lightGrayColor];

    [_myTextView addSubview:placeHoderLable];

    _myTextView.delegate=self;

    //记得设置textview的代理 _myTextView.returnKeyType=UIReturnKeyDone;

    在textview的代理方法中实现以下代码

    -(void)textViewDidChange:(UITextView *)textView {

    if ([_myTextView.text length] == 0) {

    [placeHoderLable setHidden:NO]; }

    else{ [placeHoderLable setHidden:YES]; }

    }

    - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText: (NSString *)text {

    if([text isEqualToString:@" "]){

    [textView resignFirstResponder]; return NO; }

    if (range.location>=100) {

    _yuNumLable.text=@"还能输入0字"; return NO; }

    else {

    _yuNumLable.text=[NSString stringWithFormat:@"还能输入%lu字",100-range.location];

    return YES;

    }

    }

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  • 原文地址:https://www.cnblogs.com/graveliang/p/5682026.html
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