UITextView在可见文本的末尾添加...更多按钮

Question

UITextView在Facebook的可见文本末尾添加...更多按钮。 如果它已经在某处提及，我很抱歉。具体而言，我很感兴趣如何计算可见文本结束的位置与包装字

Answer 1

1。根据文本和字体检查UItextView大小：

// return the size for UITextView for both IOS7 and IOS6 
-(CGSize) getSizeWithMaxLabelSize:(CGSize) maxLabelSize forTextViewWithText:(NSString *) text 
{ 
CGSize expectedLabelSize; 
CGSize maximumLabelSize = maxLabelSize; 
if (SYSTEM_VERSION_GREATER_THAN(@"6.2")) { 
    NSDictionary *stringAttributes = [NSDictionary dictionaryWithObject:[UIFont fontWithName:@"Arial" size:EPCommentViewFontSize] forKey: NSFontAttributeName]; 
    CGRect rect =[text boundingRectWithSize:maximumLabelSize options:NSStringDrawingUsesLineFragmentOrigin attributes:stringAttributes context:nil]; 
    expectedLabelSize = rect.size; 
    expectedLabelSize.height = ceilf(expectedLabelSize.height); 
    expectedLabelSize.width = ceilf(expectedLabelSize.width); 
} else { 
    expectedLabelSize = [text sizeWithFont:[UIFont fontWithName:@"Arial" size:EPCommentViewFontSize] constrainedToSize:maximumLabelSize lineBreakMode:NSLineBreakByWordWrapping]; 
} 
    return expectedLabelSize; 
} 

2。将您的UITextView高度与expectedLabelSize.height进行比较以显示或不是

3。更改UITextView frame.size.height触摸视图时更多

CGRect frame = _textView.frame; 
frame.size.height = [self getSizeWithMaxLabelSize:CGSizeMake(_textView.frame.size.height, NSIntegerMax) forTextViewWithText:_textView.text].height; 
_textView.frame = frame;