使用iOS 7 SDK构建时,UITextView会包装文本

Question

我有一个UITextView内部的UIScrollView工作完美无缺的iOS 6建造xcode 4.x,但现在建设与xcode 5它无法正常工作,甚至在iOS 6.

问题是,即使屏幕宽度的文本换行UITextView,并UIScrollView有较大的宽度.我使用此代码来计算出新的宽度和高度UITextView,即使textview向左/向右滚动,文本也会被包裹,好像宽度只是屏幕的宽度.

谢谢

self.responceTextView.text = [NSString stringWithFormat:@"%@%@",_responceTextView.text,responce];
[self textViewDidChange:self.responceTextView];

- (void)textViewDidChange:(UITextView *)textView
{
    // Recalculate size of text field
    CGSize maxSize = CGSizeMake(MAXFLOAT, MAXFLOAT);
    CGSize reqSize = [textView.text sizeWithFont:[UIFont fontWithName:@"Courier" size:12] constrainedToSize:maxSize lineBreakMode:NSLineBreakByClipping];

    self.responceTextView.frame = CGRectMake(0, 0, reqSize.width+16, reqSize.height+16);

    // Resize scroll view if needs to be smaller so text stays at top of screen
    CGFloat maxScrollHeight = maxScrollViewSize.size.height;
    if (self.responceTextView.frame.size.height < maxScrollHeight) {
        self.responceScrollView.frame = CGRectMake(self.responceScrollView.frame.origin.x, self.responceScrollView.frame.origin.y, self.responceScrollView.frame.size.width, self.responceTextView.frame.size.height);
    } else {
        self.responceScrollView.frame = maxScrollViewSize;
    }

    // Set content size
    self.responceScrollView.contentSize = CGSizeMake(self.responceTextView.frame.size.width, self.responceTextView.frame.size.height);

    [self scrollToCursor];
}

编辑----

好吧,所以它似乎sizeWithFont在iOS 7中被弃用了.奇怪的是我没有得到编译器警告.它仍然没有意义,它在iOS 6上不起作用(或者在使用iOS 7 SDK构建时是否完全删除？)

我尝试了这两种替代方案,但从所有方面获得完全相同的大小.

NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                [UIFont fontWithName:@"Courier" size:12], NSFontAttributeName,
                                nil];
CGRect rect = [textView.text boundingRectWithSize:maxSize options:NSLineBreakByClipping | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attributes context:nil];

收益: {{0, 0}, {439.27148, 168}}

CGSize rect2 = [textView.text sizeWithAttributes:attributes];

收益: {439.27148, 168}

原来上面的回报 {439.27148, 168}

他们都应该回归更广阔的视野.

编辑2 ----从上面看,返回的帧是正确的(439宽)但是它仍然是文本视图中包含的文字.

Answer 1

尝试使用:

[textView.text boundingRectWithSize:CGSizeMake(txtFrame.size.width, CGFLOAT_MAX)
                           options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
                           attributes:[NSDictionary dictionaryWithObjectsAndKeys:textView.font,NSFontAttributeName, nil] context:nil];

字符串测量似乎非常多.对于我所做的测试,这是唯一能够提供合适尺寸的选项组合.

我在iOS7中成功使用以下代码(它UITextField具有最小和最大高度.当文本的高度变大时MAX_HEIGHT_MESSAGE_TEXTBOX,滚动条出现在UITextField)中.

const float MAX_HEIGHT_MESSAGE_TEXTBOX = 80;
const float MIN_HEIGHT_MESSAGE_TEXTBOX = 30;


- (void)setFrameToTextSize:(CGRect)txtFrame textView:(UITextView *)textView
{

    if(txtFrame.size.height > MAX_HEIGHT_MESSAGE_TEXTBOX)
    {
        //OK, the new frame is to large. Let's use scroll
        txtFrame.size.height = MAX_HEIGHT_MESSAGE_TEXTBOX;
        textView.scrollEnabled = YES;
        [textView scrollRangeToVisible:NSMakeRange([textView.text length], 0)];
    }
    else
    {
        if (textView.frame.size.height < MIN_HEIGHT_MESSAGE_TEXTBOX) {
             //OK, the new frame is to small. Let's set minimum size
            txtFrame.size.height = MIN_HEIGHT_MESSAGE_TEXTBOX;
        }
        //no need for scroll
        textView.scrollEnabled = NO;
    }
    //set the frame
    textView.frame = txtFrame;
}

- (void)setframeToTextSize:(UITextView *)textView animated:(BOOL)animated
{
    //get current height
    CGRect txtFrame = textView.frame;

    //calculate height needed with selected font. Note the options.
    //append a new line to make space for the cursor after user hit the return key
    txtFrame.size.height =[[NSString stringWithFormat:@"%@\n ",textView.text]
                           boundingRectWithSize:CGSizeMake(txtFrame.size.width, CGFLOAT_MAX)
                           options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
                           attributes:[NSDictionary dictionaryWithObjectsAndKeys:textView.font,NSFontAttributeName, nil] context:nil].size.height;

    if (animated) {
        //set the new frame, animated for a more nice transition
        [UIView animateWithDuration:0.2 delay:0.0 options:UIViewAnimationOptionCurveEaseOut |UIViewAnimationOptionAllowAnimatedContent animations:^{
            [self setFrameToTextSize:txtFrame textView:textView];
        } completion:nil];
    }
    else
    {
        [self setFrameToTextSize:txtFrame textView:textView];
    }
}

- (void)textViewDidChange:(UITextView *)textView
{
    [self setframeToTextSize:textView animated:YES];
}

编辑

当串测量是正确的,则可能需要更改lineBreakMode上UITextView的textContainer.(NSTextContainer是iOS7中的新类,包含有关如何布局文本的信息):

textView.textContainer.lineBreakMode = NSLineBreakByCharWrapping; // default is NSLineBreakByWordWrapping 

祝好运!

Answer 2

该方法sizeWithFont:(UIFont *)font constrainedToSize ..."在 iOS 7 中已被弃用。

它将正常运行。

查看 iOS 7 中的替代方案

的实例方法NSString

-(CGRect)boundingRectWithSize:(CGSize)size options:(NSStringDrawingOptions)options attributes:

(NSDictionary *)attributes context:(NSStringDrawingContext *)context

检查一下这个答案。 替换已弃用的 sizeWithFont: 在 iOS 7 中？