iOS UITextView限制字数

//UITextVIew输入框

self.contentTV = [[UITextView alloc] initWithFrame:CGRectMake(0, lineVIewOne.frame.origin.y+lineVIewOne.frame.size.height+1,self.view.frame.size.width, 160)];

self.contentTV.backgroundColor = [UIColor whiteColor];

self.contentTV.textAlignment = NSTextAlignmentLeft;

//self.contentTV.text = @"您在使用中有遇到什么问题?可以向我们及时反馈噢!";

self.contentTV.font = [UIFont systemFontOfSize:14.0];

self.contentTV.keyboardType = UIKeyboardTypeNamePhonePad;

self.contentTV.clearsOnInsertion = YES;

[self.view addSubview:self.contentTV];

self.contentTV.delegate = self;

self.placehoderLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.contentTV.frame.size.width, 30)];

self.placehoderLabel.backgroundColor = [UIColor whiteColor];

self.placehoderLabel.text = @"您在使用中有遇到什么问题?可以向我们及时反馈噢!";

//self.placehoderLabel.alpha = 0.5;

//self.placehoderLabel.textAlignment = NSTextAlignmentCenter;

self.placehoderLabel.font = [UIFont systemFontOfSize:13.0];

[self.contentTV addSubview:self.placehoderLabel];

 

#pragma mark - UITextViewDelegate

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

{

NSString *temp = [textView.text

stringByReplacingCharactersInRange:range

withString:text];

 

NSInteger remainTextNum = 100;

//计算剩下多少文字可以输入

if(range.location>=100)

{

remainTextNum = 0;

[self showSimpleAlert:@"请输入小于100个字！"];

self.emailFT.userInteractionEnabled = NO;

return YES;

}

else

{

NSString * nsTextContent = temp;

NSInteger existTextNum = [nsTextContent length];

remainTextNum =100-existTextNum;

self.label = [[UILabel alloc] initWithFrame:CGRectMake(textView.frame.size.width-80, textView.frame.size.height-30, 80, 30)];

self.label.textAlignment = NSTextAlignmentCenter;

[textView addSubview:self.label];

self.label.backgroundColor = [UIColor whiteColor];

self.label.text = [NSString stringWithFormat:@"%ld/100",(long)remainTextNum];

return YES;

}

}

 

 

当你输入的时候,label上会显示还剩余多少字