我有一个 UIView 女巫以编程方式填充内容。此 UIView 中的布局是使用自动布局进行的。
这个视图需要是一个 UIScrollView 的子视图，并且需要垂直滚动。
我有这样的代码：
// self.scrollview is defined in IB and it has constraints to edges (margin:0 0 0 0)
UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, MAXFLOAT)];
[contentView setTranslatesAutoresizingMaskIntoConstraints:YES];
// Then I call some my parser which add subviews to the contentView and layout them using constraints.
[self.scrollview addSubview:contentView];
[contentView setNeedsLayout];
[contentView layoutIfNeeded];
// Now, I need to know height of the contentView to be able to set contentSize to self.scrollview
//更新
好的，我有这个 UILabel，添加到 self.content 这是 UIView 创建的：[[UIView alloc] initWithFrame:CGRectMake(self.layoutMargin, self.layoutMargin, 1024 - self.layoutMargin*2, 100)]);
这个 self.content 视图对我来说只是容器，需要放在一些UIScrollView. 我需要 self.content 的高度来设置UIScrollView.
[self.content setTranslatesAutoresizingMaskIntoConstraints:YES];
[self.content setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
[self.content setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
UILabel *textlabel = [[UILabel alloc] init];
UIFont *font;
font = [UIFont fontWithName:@"InterstatePlus-Regular" size:16];
UIFont *bold;
bold = [UIFont fontWithName:@"InterstatePlus-Bold" size:16];
NSDictionary *style = @{
@"$default" : @{NSFontAttributeName : font},
@"b" : @{NSFontAttributeName : bold},
@"em" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Italic" size:14]},
@"h1" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Medium" size:48]},
@"h2" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Medium" size:36]},
@"h3" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Medium" size:32]},
@"h4" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Medium" size:24]},
@"h5" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Medium" size:18]},
@"h6" : @{NSFontAttributeName : [UIFont fontWithName:@"HelveticaNeue-Medium" size:16]}
};
[textlabel setNumberOfLines:0];
NSError *error = nil;
NSString *string = @"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing <br>Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type<br> and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.";
NSString *replacedString = [string stringByReplacingOccurrencesOfString:@"<br>" withString:@"\n"];
NSAttributedString *attributedString = [SLSMarkupParser attributedStringWithMarkup:replacedString style:style error:&error];
NSMutableAttributedString *mutAttributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];
NSInteger strLength = [attributedString length];
NSMutableParagraphStyle *paragraphstyle = [[NSMutableParagraphStyle alloc] init];
[mutAttributedString addAttribute:NSParagraphStyleAttributeName
value:paragraphstyle
range:NSMakeRange(0, strLength)];
if (mutAttributedString) {
textlabel.attributedText = mutAttributedString;
}
[textlabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[textlabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
[textlabel setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
textlabel.textAlignment = NSTextAlignmentLeft;
[textlabel setTextColor:[UIColor blackColor]];
[textlabel setBackgroundColor:[UIColor clearColor]];
textlabel.lineBreakMode = NSLineBreakByWordWrapping;
[textlabel setNumberOfLines:0];
[self.content addSubview:textlabel];
[textlabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.content.mas_top).with.offset(0);
make.right.equalTo(self.content.mas_right).with.offset(0);
make.height.equalTo(@1200);
make.left.equalTo(self.content.mas_left).with.offset(0);
}];
[self.containerView addSubview:self.content];
[self.containerView setBackgroundColor:[UIColor redColor]];
[self.content setBackgroundColor:[UIColor yellowColor]];
CGSize s = [self.content systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
NSLog(@"Size: %f %f", s.width, s.height);
这是日志：大小：17713.000000 0.000000
它看起来像：http ://d.pr/i/Rxku