iphone常用控件之UITextView

//-(void)loadView{
//    [super loadView];
//    CGRect bounds = [[UIScreen mainScreen] applicationFrame];
//    UITextView *textView = [[UITextView alloc] initWithFrame:bounds];
//    self.view = textView;
//}

//将文本视图附加到一个已有的试图对象上
-(void)loadView{
    [super loadView];
    CGRect viewRect = CGRectMake(0, 100, 320, 200);
    
    UITextView *textView = [[UITextView alloc] initWithFrame:viewRect];
    
    //颜色
    UIColor *myColorHue = [UIColorcolorWithHue:120.0/360.0saturation:0.75brightness:0.50alpha:1.0];
    //    UIColor *myColorRGB = [UIColor colorWithRed:0.75 green:1.0 blue:0.75 alpha:1.0];
    //    UIColor *myWhiteTransparentColor = [UIColor colorWithWhite:1.0 alpha:0.50];
    //    UIColor *myColor = [UIColor redColor]; 
    textView.textColor = myColorHue;
    
    //字体与大小
    UIFont *myFixed = [UIFont fontWithName:@"Courier New" size:10.0];
    //    UIFont *mySystemFont = [UIFont systemFontOfSize:12.0];
    //    UIFont *myBoldSystemFont = [UIFont boldSystemFontOfSize:12.0];
    //    UIFont *myItalicSystemFont = [UIFont italicSystemFontOfSize:12.0];
    textView.font = myFixed;
    
    textView.editable = NO;  //设置为不可编辑，默认的为可编辑
    
    //赋予内容
    textView.text = @"hello .bit hold ";
    
    //分别为左中右对齐
    textView.textAlignment = UITextAlignmentLeft;
    //    textView.textAlignment = UITextAlignmentCenter;
    //    textView.textAlignment = UITextAlignmentRight;
    
    //直接赋值
    int nBottles = 100;
    NSString *myFormattedString = [[NSString alloc]initWithFormat:@"%d bottles of beer on the wall",nBottles];
    textView.text = myFormattedString;
    
    //读取文件
    //    NSString *myFile = [NSHomeDirectory() stringByAppendingPathComponent:@"Document/file.txt"];
    //    NSString *myFileString = [NSString stringWithContentsOfFile:myFile encoding:nil error:nil];
    //    textView.text = myFileString;
    
    //键盘属性
    textView.keyboardType = UIKeyboardTypePhonePad; //键盘风格，8种
    textView.keyboardAppearance = UIKeyboardAppearanceAlert; //键盘外观，两种：浅灰色或深灰色
    textView.returnKeyType = UIReturnKeyGo; //回车键的风格 11种
    textView.autocapitalizationType = UITextAutocapitalizationTypeNone;//自动大写功能 4种
    textView.autocorrectionType = UITextAutocorrectionTypeDefault;  //自动更正
    textView.secureTextEntry = YES; //安全文本输入，即输入后会显示＊号
    
    [self.view addSubview:textView];
}

 

UITextView协议：

//点击开始编辑：
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView;
- (void)textViewDidBeginEditing:(UITextView *)textView;

 

//结束编辑

- (BOOL)textViewShouldEndEditing:(UITextView *)textView;

- (void)textViewDidEndEditing:(UITextView *)textView;

 

//更改内容
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text;
- (void)textViewDidChange:(UITextView *)textView;

- (void)textViewDidChangeSelection:(UITextView *)textView;

 

---

//每次用户通过键盘输入字符时，在字符显示在text view之前，textView:shouldChangeCharactersInRange:replacementString方法会被调用。这个方法中可以方便的定位测试用户输入的字符，并且限制用户输入特定的字符。在上面的代码中，我使用done键来隐藏键盘：通过检测看replacement文本中是否包含newLineCharacterSet任意的字符。

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{ 
    NSCharacterSet *doneButtonCharacterSet = [NSCharacterSet newlineCharacterSet]; 
    NSRange replacementTextRange = [text rangeOfCharacterFromSet:doneButtonCharacterSet]; 
    NSUInteger location = replacementTextRange.location; 
    if (textView.text.length + text.length > 140){ 
    if (location != NSNotFound){ 
        [textView resignFirstResponder]; 
    } 
    return NO; 
    } 
    else if (location != NSNotFound){ 
    [textView resignFirstResponder]; 
    return NO; 
    } 
    return YES; 
}

 

---

---

限制textview输入字数:

#pragma mark - UITextViewDelegate
- (void)textViewDidChange:(UITextView*)textView{
   if(self.commentTextView.text.length>140){
       self.commentTextView.text= [self.commentTextView.textsubstringToIndex:140];
    }
   
   self.limitLabel.text= [NSStringstringWithFormat:@"%d",140- [self.commentTextView.textlength]];
   
   
   //TODO:根据高度调整
   if(SCREENT_HEIGHT==480) {
       CGSizesize = [self.commentTextView.textsizeWithFont:self.commentTextView.fontconstrainedToSize:CGSizeMake(320,440)lineBreakMode:NSLineBreakByWordWrapping];
       
       if(size.height<=54) {//三行之内
            [self.contentScrollsetContentOffset:CGPointMake(0,0)];
        }else{
           if(size.height-54-self.contentScroll.contentOffset.y>0) {
                [self.contentScrollsetContentOffset:CGPointMake(0,self.contentScroll.contentOffset.y+18)];
            }else{
               if(size.height-54-self.contentScroll.contentOffset.y< 0) {
                    [self.contentScrollsetContentOffset:CGPointMake(0,self.contentScroll.contentOffset.y-18)];
                }
            }
        }
    }
}
-(BOOL)textView:(UITextView*)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString*)text{
   if(1== range.length) {
       returnYES;
    }
   if([textisEqualToString:@"\n"]) {//按下return键
        [textViewresignFirstResponder];
        [self.contentScrollsetContentOffset:CGPointMake(0,0)];
       returnNO;
    }else{
       if([textView.textlength] <=140) {//判断字符个数
           returnYES;
        }
    }
   returnNO;
}