使用iOS 7 SDK构建时，UITextView会包装文本 [英] UITextView wraps text when built with iOS 7 SDK
问题描述
我在 UIScrollView 中有一个 UITextView ，它在 iOS 6 从 xcode 4.x 构建，但现在使用 xcode 5 构建它不起作用正确，即使在 iOS 6 。
问题是文本包装屏幕宽度即使 UITextView 和 UIScrollView 的宽度很大。我使用此代码来计算 UITextView 的新宽度和高度，即使textview向左/向右滚动，文本也会被包裹，好像宽度只是宽度屏幕。
谢谢
self.responceTextView.text = [NSString stringWithFormat：@％@％@，_ responceTextView.text，responce];
[self textViewDidChange：self.responceTextView];
- （void）textViewDidChange：（UITextView *）textView
{
//重新计算文本字段的大小
CGSize maxSize = CGSizeMake（MAXFLOAT，MAXFLOAT）;
CGSize reqSize = [textView.text sizeWithFont：[UIFont fontWithName：@Couriersize：12] constrainedToSize：maxSize lineBreakMode：NSLineBreakByClipping];
self.responceTextView.frame = CGRectMake（0,0，reqSize.width + 16，reqSize.height + 16）;
//如果需要更小，请调整滚动视图的大小，使文本保持在屏幕顶部
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;
}
//设置内容大小
self.responceScrollView.contentSize = CGSizeMake（self.responceTextView.frame.size.width，self.responceTextView.frame.size.height） ;
[self scrollToCursor];
}
编辑----
好的，所以似乎 sizeWithFont 在iOS 7中已被弃用。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？）
I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：@Couriersize：12]，NSFontAttributeName，
nil];
CGRect rect = [textView.text boundingRectWithSize：maxSize选项：NSLineBreakByClipping | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading属性：attributes context：nil];
返回： {{0,0}，{439.27148,168}}
CGSize rect2 = [textView.text sizeWithAttributes：attributes];
返回： {439.27148,168}
以上原件返回 {439.27148,168}
<他们都应该回归更广阔的视野。
编辑2 ----
从上面可以看出，返回的帧是正确的（439宽）然而它仍然是文字包裹在里面textview。
尝试使用：
[textView.text boundingRectWithSize：CGSizeMake（txtFrame.size.width，CGFLOAT_MAX）
options：NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
属性：[NSDictionary dictionaryWithObjectsAndKeys：textView.font，NSFontAttributeName，nil] context：nil];
字符串测量似乎非常错误。对于我已经完成的测试，这是唯一给出正确大小的选项组合。
我在iOS7中使用以下代码并成功（它是 UITextField 具有最小和最大高度。当文本的高度变大但 MAX_HEIGHT_MESSAGE_TEXTBOX 时，滚动条会出现在
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）
{
//好的，新的框架很大。让我们使用滚动
txtFrame.size.height = MAX_HEIGHT_MESSAGE_TEXTBOX;
textView.scrollEnabled = YES;
[textView scrollRangeToVisible：NSMakeRange（[textView.text length]，0）];
}
其他
{
if（textView.frame.size.height< MIN_HEIGHT_MESSAGE_TEXTBOX）{
//好的，新框架很小。我们设置最小尺寸
txtFrame.size.height = MIN_HEIGHT_MESSAGE_TEXTBOX;
}
//无需滚动
textView.scrollEnabled = NO;
}
//设置框架
textView.frame = txtFrame;
}
- （void）setframeToTextSize：（UITextView *）textView animated：（BOOL）animated
{
//获取当前高度
CGRect txtFrame = textView.frame;
//计算所选字体所需的高度。请注意选项。
//在用户点击返回键后附加一个新行为光标腾出空间
txtFrame.size.height = [[NSString stringWithFormat：@％@ \ n，textView.text]
boundingRectWithSize：CGSizeMake（txtFrame.size.width，CGFLOAT_MAX）
选项：NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
属性：[NSDictionary dictionaryWithObjectsAndKeys：textView.font，NSFontAttributeName，nil] context：nil] .size.height;
if（animated）{
//设置新帧，为更好的过渡设置动画
[UIView animateWithDuration：0.2 delay：0.0选项：UIViewAnimationOptionCurveEaseOut | UIViewAnimationOptionAllowAnimatedAtent动画：^ {
[self setFrameToTextSize：txtFrame textView：textView];
}完成：nil];
}
else
{
[self setFrameToTextSize：txtFrame textView：textView];
}
}
- （void）textViewDidChange：（UITextView *）textView
{
[self setframeToTextSize：textView animated：YES];
}
编辑
当字符串测量正确时，您可能需要更改 UITextView 上的 lineBreakMode 的textContainer。 （ NSTextContainer 是iOS7中的一个新类，包含有关文本应如何布局的信息）：
textView.textContainer.lineBreakMode = NSLineBreakByCharWrapping; //默认为NSLineBreakByWordWrapping
祝你好运！
I have a UITextView inside a UIScrollView that worked perfectly fine on iOS 6 built from xcode 4.x, however now building with xcode 5 it doesn't work properly, even on iOS 6.
The problem is the text wraps with the screen width even though the UITextView and UIScrollView have large widths. I use this code to work out the new width and height of the UITextView, and even though the textview scrolls left/right the text is wrapped as if the width is only the width of the screen.
Thanks
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];
}
EDIT ----
Ok, so it seems sizeWithFont is deprecated in iOS 7. Strange how I get no compiler warning.
It still doesn't make sense that it doesn't work on iOS 6 (or is it completely removed when built with iOS 7 SDK?)
I have tried these 2 alternatives, but get exactly the same size back from all.
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];
returns: {{0, 0}, {439.27148, 168}}
CGSize rect2 = [textView.text sizeWithAttributes:attributes];
returns: {439.27148, 168}
And the original above returns {439.27148, 168}
They should all return a wider view.
EDIT 2 ---- It seems from above that the returned frame is correct (439 wide) however it's the text that is still being word wrapped inside the textview.
try using:
[textView.text boundingRectWithSize:CGSizeMake(txtFrame.size.width, CGFLOAT_MAX)
options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading
attributes:[NSDictionary dictionaryWithObjectsAndKeys:textView.font,NSFontAttributeName, nil] context:nil];
The string measuring seems pretty buggy. This is the only option combination that gives the right size, for the testing I have done.
I'm using the following code with success in iOS7 (it's a UITextField with a minimum and maximum height. When the text's height get larger then MAX_HEIGHT_MESSAGE_TEXTBOX, scrollbars appears in the UITextField).
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];
}
EDIT
When the string measuring is correct, you might need to change the lineBreakModeon the UITextView's textContainer. (NSTextContainer is a new class in iOS7, containing information about how text should be laid out):
textView.textContainer.lineBreakMode = NSLineBreakByCharWrapping; // default is NSLineBreakByWordWrapping
Good luck!
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