UILabel - 具有灵活的尺寸和固定空间的问题

Question

我正在尝试查看有关3种不同标签的信息; 第一。标题 二。发布日期 三。描述

标题和发布日期之间有两个空行。有时当标题在出版日期写入超过3行时。 这是一张图片（粗线是pub日期标签）：

，有时当描述标签收到大量文字时会发生什么：

这应该是：

所以问题：  1.如何在标题和pubdate之间保存固定空间？ （无论标题在两个固定空间之间保留多少行）  2.当他获得大量文本时，为什么描述会向下移动？我怎么能找到他的位置？

我只想在3个标签之间保存一个空格，无论每个标签有多少行。

到目前为止，这是我的代码：

- (void)viewDidLoad
{


    [super viewDidLoad];

    [_scroller setScrollEnabled:YES];
    [_scroller setContentSize:CGSizeMake(320, 600)];


    self.lblDescription.text = self.description;
    self.lblTitle.text = self.stitle;
    self.lblPubDate.text = self.pubDate;


    self.lblTitle.numberOfLines = 0;
    [self.lblTitle sizeToFit];
    self.lblTitle.textAlignment = UITextAlignmentRight;
    CGRect titleFram = self.lblTitle.frame;
    titleFram = CGRectMake(titleFram.origin.x, titleFram.origin.y, 280, titleFram.size.height);
    self.lblTitle.frame = titleFram;

    self.lblDescription.numberOfLines = 0;
    [self.lblDescription sizeToFit];

    [self resizeHeightToFitForLabel:self.lblTitle];
    [self resizeHeightToFitForLabel:self.lblDescription];


}
-(void)resizeHeightToFitForLabel:(UILabel *)label
{
    CGRect newFrame         = label.frame;
    newFrame.size.height    = [self heightForLabel:label withText:label.text];
    label.frame             = newFrame;
}

-(CGFloat)heightForLabel:(UILabel *)label withText:(NSString *)text
{
    CGSize maximumLabelSize     = CGSizeMake(290, FLT_MAX);

    CGSize expectedLabelSize    = [text sizeWithFont:label.font
                                   constrainedToSize:maximumLabelSize
                                       lineBreakMode:label.lineBreakMode];

    return expectedLabelSize.height;
}

完成这项工作的最佳方法是什么？ 感谢..

Answer 1

你可以这样试试，

NSString *lbltext1 = lblTitle.text;
    NSString *lbltext2 = lblDate.text;
    NSString *lbltext3 = lblDesc.text;

CGRect rect = self.lblTitle.frame;
rect.size.height = [ViewController calculateHeightForText:lbltext1 font:self.lblTitle.font size:CGSizeMake(rect.size.width, 40000)].height;
self.lblTitle.frame = rect;

rect = self.lblDate.frame;
rect.origin.y = CGRectGetMaxY(self.lblTitle.frame) + 5;
rect.size.height = [ViewController calculateHeightForText:lbltext2 font:self.lblDate.font size:CGSizeMake(rect.size.width, 40000)].height;
self.lblDate.frame = rect;

rect = self.lblDesc.frame;
rect.origin.y = CGRectGetMaxY(self.lblDate.frame) + 5;
rect.size.height = [ViewController calculateHeightForText:lbltext3 font:self.lblDesc.font size:CGSizeMake(rect.size.width, 40000)].height;
self.lblDesc.frame = rect;

用于计算身高，

+ (CGSize)calculateHeightForText:(NSString *)text font:(UIFont *)font size:(CGSize)size {
    CGSize _size = [text sizeWithFont:font constrainedToSize:size lineBreakMode:UILineBreakModeWordWrap];
    return _size;
}

Answer 2

试试这个，

- (void)viewDidLoad
{
    [super viewDidLoad];

    [_scroller setScrollEnabled:YES];
    [_scroller setContentSize:CGSizeMake(320, 600)];

    //Use this way
    [self positionLabel:self.lblTitle withText:self.stitle withY:10];
    [self positionLabel:self.lblPubDate withText:self.pubDate withY:CGRectGetMaxY(self.lblTitle.frame)+10 ];
    [self positionLabel:self.lblDescription withText:self.description withY:CGRectGetMaxY(SELF.lblPubDate.frame)+10 ];

}

-(void)positionLabel:(UILabel*)lbl withText:(NSString*)text withY:(CGFloat)Y
{
    lbl.textAlignment = UITextAlignmentRight;
    lbl.text = text;
    lbl.numberOfLines = 0;
    lbl.lineBreakMode = NSLineBreakByWordWrapping;
    CGSize size = [self calculateSize:lbl];
    //FIXED
    [lbl setFrame:CGRectMake(10 , Y , (size.width>310)?size.width:310 , size.height)]; 
}

-(CGSize)calculateSize:(UILabel*)lbl
{
    CGSize size = [lbl.text sizeWithFont:lbl.font
                       constrainedToSize:CGSizeMake(310, MAXFLOAT)
                           lineBreakMode:UILineBreakModeWordWrap];
    return size;
}

Answer 3

使用我的波纹管自定义方法计算其内容高度...

(float) calculateHeightOfTextFromWidth:(NSString*) text: (UIFont*)withFont: (float)width :(UILineBreakMode)lineBreakMode
{
[text retain];
[withFont retain];
CGSize suggestedSize = [text sizeWithFont:withFont constrainedToSize:CGSizeMake(width, FLT_MAX) lineBreakMode:lineBreakMode];

[text release];
[withFont release];

return suggestedSize.height;
}

并像下面那样使用它。

UILabel *lblAddress = [[UILabel alloc]init];
[lblAddress setFrame:CGRectMake(110, 31, 200, 50)];        
lblAddress.text = @"your Text ";
lblAddress.lineBreakMode = UILineBreakModeWordWrap;
lblAddress.numberOfLines = 0;
lblAddress.font = [UIFont fontWithName:@"Helvetica" size:12];

lblAddress.frame = CGRectMake(lblAddress.frame.origin.x, lblAddress.frame.origin.y, 
                         200,[self calculateHeightOfTextFromWidth:lblAddress.text :lblAddress.font :200 :UILineBreakModeWordWrap] ); 

lblAddress.textColor = [UIColor darkGrayColor];

[self.view addSubview:lblAddress];

见My Blog ...

Answer 4

试试这个

 self.lblDescription.text = @"asdfasfadfsa";
    self.lblTitle.text = @"asdafsasf";
    self.lblPubDate.text = @"asdafsas";


    self.lblTitle.numberOfLines = 0;
    [self.lblTitle sizeToFit];
    self.lblTitle.textAlignment = UITextAlignmentRight;
    CGRect titleFram = self.lblTitle.frame;
    titleFram = CGRectMake(titleFram.origin.x, titleFram.origin.y, 280, titleFram.size.height);
    self.lblTitle.frame = titleFram;

    self.lblDescription.numberOfLines = 0;
    [self.lblDescription sizeToFit];

    [self resizeHeightToFitForLabel:self.lblTitle];

    CGRect pubFrame =self.lblPubDate.frame;
    pubFrame.origin.y= self.lblTitle.frame.origin.y+self.lblTitle.frame.size.height+110;

    [self.lblPubDate setFrame:pubFrame];

    CGRect descFrame =self.lblDescription.frame;
    descFrame.origin.y= self.lblPubDate.frame.origin.y+self.lblPubDate.frame.size.height+30;


    [self resizeHeightToFitForLabel:self.lblDescription];