动态调整 UITextView 的宽度和高度

Posted 2023-02-24

【中文标题】动态调整 UITextView 的宽度和高度

【英文标题】：dynamically resizing UITextView width and height

【发布时间】：2013-03-21 20:41:07

【问题描述】：

我的代码会根据文本动态调整。当我们按下回车键时，它会增加高度 除非我们按回车键，否则会增加宽度。

但是我该怎么做呢

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

CGFloat height = [textView.text sizeWithFont:textView.font].height;
CGFloat width =  [textView.text sizeWithFont:textView.font].width;
 if ([[NSCharacterSet newlineCharacterSet] characterIsMember:[text characterAtIndex:text.length-1]])
 
     self.textViewHeight += height;

     [textView setFrame:CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, width, self.textViewHeight)];
     self.contentView.frame = textView.frame;
     self.frame = textView.frame;
     [_editButton setFrame:CGRectMake(self.contentView.frame.size.width - 14, 0, 28, 28)];
   
    else

    int charsAsInt = (int)(textView.text.length);
    CGFloat charWidth = width / charsAsInt;

    [textView setFrame:CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, width+ charWidth, self.textViewHeight)];
     self.contentView.frame = textView.frame;
     self.frame = textView.frame;
     [_editButton setFrame:CGRectMake(self.contentView.frame.size.width - 14, 0, 28, 28)];

但即使我按下回车它也会增加宽度。如何预防。

【参考方案1】：

好的，宽度是所有行中整个文本的宽度。所以必须找到最大线长。

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

CGFloat height = [textView.text sizeWithFont:textView.font].height;
//CGFloat lineWidth;

int charsAsInt;
 if ([[NSCharacterSet newlineCharacterSet] characterIsMember:[text characterAtIndex:text.length-1]])
 
     self.lineWidth = 0;
     newLine = @"";
     self.textViewHeight += height;
     NSLog(@"height: %f, width: %f, new Height: %f", height, self.textViewWidth, self.textViewHeight);
     [textView setFrame:CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, self.textViewWidth, self.textViewHeight)];
     self.contentView.frame = textView.frame;
     self.frame = textView.frame;
     [_editButton setFrame:CGRectMake(self.contentView.frame.size.width - 14, 0, 28, 28)];

     [super setFrame:textView.frame];
 
 else
     newLine = [newLine stringByAppendingString:text];
     self.lineWidth = [newLine sizeWithFont:textView.font].width;
     charsAsInt = (int)(newLine.length);
     CGFloat charWidth = self.lineWidth / charsAsInt;


     if(self.lineWidth >= self.textViewWidth)
         self.textViewWidth = self.lineWidth;
         [textView setFrame:CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, self.lineWidth, self.textViewHeight)];
     

     else
         [textView setFrame:CGRectMake(self.contentView.frame.origin.x, self.contentView.frame.origin.y, self.textViewWidth, self.textViewHeight)];
     
     self.contentView.frame = textView.frame;
     self.frame = textView.frame;
     [_editButton setFrame:CGRectMake(self.contentView.frame.size.width - 14, 0, 28, 28)];
     //[super setContentView:self.contentView];
     [super setFrame:textView.frame];


return YES;

发生的事情是我们有一个多行 UITextView 贴纸，所以当你在键盘上按回车键时，你有一个新行。我现在将其存储在一个新变量中。只有当新行的宽度大于旧行的宽度时，整个 textVIew 的宽度才会增加(self.textViewWidth)