如何计算多行 UITextview 的宽度？

Question

我有一个UITextView，最多有四行。我想在每一行后面加上UILabels，只覆盖相应行的文本。

那么你们中的任何一位优秀的编码员对我将如何计算每条线的宽度有任何想法吗？

Answer 1

试试这个

UIFont *font=[UIFont systemFontOfSize:17.0f];

UILabel *yourLabel=[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 80)];
yourLabel.numberOfLines=4;
yourLabel.text=@"Hello\nHulo\nMe\nyou";

CGSize labelSize = [yourLabel.text sizeWithFont:font
                              constrainedToSize:yourLabel.frame.size
                                  lineBreakMode:NSLineBreakByTruncatingTail];
CGFloat singleLineHeight = labelSize.height/yourLabel.numberOfLines;


[self.view addSubview:yourLabel];

单行高度约为 21。

NSLog(@"single line height is %f",singleLineHeight);

对于文本查看请遵循此代码

UITextView *yourView=[[UITextView alloc] initWithFrame:CGRectMake(0, 0, 100, 20)];
yourView.font=[UIFont systemFontOfSize:14.0f];
yourView.text    = @"Hello \nmy\n Friend\n Hru? ";

CGSize textViewSize = [yourView.text sizeWithFont:yourView.font
                       constrainedToSize:CGSizeMake(yourView.frame.size.width, FLT_MAX)
                           lineBreakMode:NSLineBreakByTruncatingTail];

[yourView setFrame:CGRectMake(0, 0, textViewSize.width, textViewSize.height)];

[self.view addSubview:yourView];

NSLog(@"single line height is %f",yourView.frame.size.height);