IOS - UIView中使用AutoLayout的UILabel动态高度
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【中文标题】IOS - UIView中使用AutoLayout的UILabel动态高度【英文标题】：IOS - UILabel dynamic height in UIView using AutoLayout 【发布时间】：2015-06-23 18:08:23 【问题描述】：我有一个 UITableView 和自定义 UITableViewCell。我在单元格内添加了 AutoLayout，在这个单元格中，我有一个需要动态更改其高度的 UILabel，然后我有一个 UIView，其中包含其他子视图，包括需要动态更改其高度的 UILabel。我没有收到任何错误，但这是自定义 UITableViewCell：
动态文本应该在动态文本之后强制底部 UIView。但正如你所见，动态文本通过了底部的 UIView。
#import "PostTableViewCell.h"
@implementation PostTableViewCell
@synthesize main;
@synthesize top;
@synthesize center;
@synthesize bottom;
@synthesize labelMessage;
@synthesize labelCat;
@synthesize labelUser;
@synthesize labelDate;
@synthesize imageviewThreadImage;
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self)
[self.contentView setTranslatesAutoresizingMaskIntoConstraints:NO];
self.contentView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
main = [UIView new];
[self.contentView addSubview:main];
main.translatesAutoresizingMaskIntoConstraints = NO;
//[main sizeToFit];
main.backgroundColor = [UIColor whiteColor];
top = [UIView new];
[main addSubview:top];
top.translatesAutoresizingMaskIntoConstraints = NO;
//[top sizeToFit];
top.backgroundColor = [UIColor whiteColor];
labelUser = [UILabel new];
[top addSubview:labelUser];
labelUser.translatesAutoresizingMaskIntoConstraints = NO;
//[labelUser sizeToFit];
[labelUser setFont:[UIFont systemFontOfSize:14]];
labelUser.textColor = [UIColor colorWithRed:(114.0/255.0) green:(114.0/255.0) blue:(114.0/255.0) alpha:1.0];
labelDate = [UILabel new];
[top addSubview:labelDate];
labelDate.translatesAutoresizingMaskIntoConstraints = NO;
[labelDate sizeToFit];
[labelDate setFont:[UIFont systemFontOfSize:14]];
labelDate.textColor = [UIColor colorWithRed:(114.0/255.0) green:(114.0/255.0) blue:(114.0/255.0) alpha:1.0];
center = [UIView new];
[main addSubview:center];
center.translatesAutoresizingMaskIntoConstraints = NO;
[center sizeToFit];
center.backgroundColor = [UIColor whiteColor];
imageviewThreadImage = [UIImageView new];
[center addSubview:imageviewThreadImage];
imageviewThreadImage.translatesAutoresizingMaskIntoConstraints = NO;
imageviewThreadImage.backgroundColor = [UIColor colorWithRed:(207.0/255.0) green:(215.0/255.0) blue:(248.0/255.0) alpha:1.0];
labelMessage = [UILabel new];
[center addSubview:labelMessage];
labelMessage.translatesAutoresizingMaskIntoConstraints = NO;
[labelMessage sizeToFit];
[labelMessage setFont:[UIFont systemFontOfSize:14]];
labelMessage.preferredMaxLayoutWidth = screenWidth - 10 - 36;
labelMessage.lineBreakMode = NSLineBreakByWordWrapping;
labelMessage.numberOfLines = 0;
labelMessage.textColor = [UIColor lightGrayColor];
bottom = [UIView new];
[main addSubview:bottom];
bottom.translatesAutoresizingMaskIntoConstraints = NO;
[bottom sizeToFit];
labelCat = [UILabel new];
[bottom addSubview:labelCat];
labelCat.translatesAutoresizingMaskIntoConstraints = NO;
[labelCat sizeToFit];
[labelCat setFont:[UIFont systemFontOfSize:12]];
labelCat.textColor = [UIColor colorWithRed:(58.0/255.0) green:(82.0/255.0) blue:(207.0/255.0) alpha:1.0];
return self;
- (void)layoutSubviews
[super layoutSubviews];
// Make sure the contentView does a layout pass here so that its subviews have their frames set, which we
// need to use to set the preferredMaxLayoutWidth below.
[self.contentView setNeedsLayout];
[self.contentView layoutIfNeeded];
// Set the preferredMaxLayoutWidth of the mutli-line bodyLabel based on the evaluated width of the label's frame,
// as this will allow the text to wrap correctly, and as a result allow the label to take on the correct height.
self.labelMessage.preferredMaxLayoutWidth = CGRectGetWidth(self.labelMessage.frame);
- (void)updateConstraints
[super updateConstraints];
if (self.didSetupConstraints) return;
NSDictionary *viewsDictionary7 = @@"main":main;
NSArray *constraint_H37 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[main]|"
options:0
metrics:nil
views:viewsDictionary7];
NSArray *constraint_V37 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[main]|"
options:0
metrics:nil
views:viewsDictionary7];
[self.contentView addConstraints:constraint_H37];
[self.contentView addConstraints:constraint_V37];
NSDictionary *viewsDictionary3 = @@"top":top,@"center":center,@"bottom":bottom,@"labelMessage":labelMessage;
NSArray *constraint_H3 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[top]-5-[center]-5-[bottom]-10-|"
options:0
metrics:nil
views:viewsDictionary3];
NSArray *constraint_H33 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[top]|"
options:0
metrics:nil
views:viewsDictionary3];
NSArray *constraint_H333 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[center]|"
options:0
metrics:nil
views:viewsDictionary3];
NSArray *constraint_H3335657 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[bottom]|"
options:0
metrics:nil
views:viewsDictionary3];
NSDictionary *viewsDictionary4 = @@"labelUser":labelUser,@"labelDate":labelDate;
NSArray *constraint_H4 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[labelUser]|"
options:0
metrics:nil
views:viewsDictionary4];
NSDictionary *viewsDictionary45 = @@"labelDate":labelDate;
NSArray *constraint_H4555 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[labelDate]|"
options:0
metrics:nil
views:viewsDictionary45];
NSArray *constraint_H44 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[labelUser]-20-[labelDate]-5-|"
options:0
metrics:nil
views:viewsDictionary4];
NSDictionary *viewsDictionary48 = @@"labelMessage":labelMessage,@"imageviewThreadImage":imageviewThreadImage;
NSArray *constraint_H48 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[labelMessage]"
options:0
metrics:nil
views:viewsDictionary48];
NSArray *constraint_H48342 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[imageviewThreadImage(36)]|"
options:0
metrics:nil
views:viewsDictionary48];
NSArray *constraint_H448 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[imageviewThreadImage(36)]-5-[labelMessage]-5-|"
options:0
metrics:nil
views:viewsDictionary48];
NSDictionary *viewsDictionary488 = @@"labelCat":labelCat;
NSArray *constraint_H488 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[labelCat]|"
options:0
metrics:nil
views:viewsDictionary488];
NSArray *constraint_H4488 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[labelCat]"
options:0
metrics:nil
views:viewsDictionary488];
[main addConstraints:constraint_H3];
////[main addConstraints:constraint_H33];
[main addConstraints:constraint_H333];
[top addConstraints:constraint_H4];
[top addConstraints:constraint_H44];
[center addConstraints:constraint_H48];
[center addConstraints:constraint_H448];
[top addConstraints:constraint_H4555];
[main addConstraints:constraint_H3335657];
[main addConstraints:constraint_H488];
[main addConstraints:constraint_H48342];
[main addConstraints:constraint_H4488];
self.didSetupConstraints = YES;
- (void)awakeFromNib
// Initialization code
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
[super setSelected:selected animated:animated];
// Configure the view for the selected state
@end
这是我得到的结果：
【问题讨论】：
问题不在于标签，它的单元格不会自行调整大小，您支持的最低 ios 版本是多少？ 我正在测试我的 iphone 4s 上的应用程序，我也使用了我的 iphone 4，但是 iphone 4 的单元格不能正常工作，如果它在 iphone 4s IOS 8.0 上工作，自动布局是否能在 iphone 5 和6？ 【参考方案1】：这是你的答案redoc01
- (CGFloat)tableView:(UITableView *)aTableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
// Get table dat
static NSString *CellIdentifier = @"CustomCell";
UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
//Create Cell
NSArray *nib;
nib = [[NSBundle mainBundle] loadNibNamed:CellIdentifier owner:self options:nil];
cell = (UITableViewCell *) [nib objectAtIndex:0];
if(indexPath.section == 0)
UILabel *dateLable = (UILabel *) [cell.contentView viewWithTag:CELL_DATE_LABLE];
dateLable.text = _string3;
[dateLable layoutIfNeeded];
return dateLable.frame.size.height;
让我知道您的反馈..
【讨论】：
【参考方案2】：我通过更改 AutoLayout 解决了这个问题，这是修改后的 UITableViewCell 使其与 AutoLayout 一起使用：
#import "PostTableViewCell.h"
@implementation PostTableViewCell
@synthesize main;
@synthesize top;
@synthesize center;
@synthesize centerLeft;
@synthesize centerRight;
@synthesize bottom;
@synthesize labelMessage;
@synthesize labelCat;
@synthesize labelUser;
@synthesize labelDate;
@synthesize imageviewThreadImage;
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self)
[self.contentView setTranslatesAutoresizingMaskIntoConstraints:NO];
self.contentView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
CGRect screenBound = [[UIScreen mainScreen] bounds];
CGSize screenSize = screenBound.size;
CGFloat screenWidth = screenSize.width;
CGFloat screenHeight = screenSize.height;
main = [UIView new];
//[self.contentView addSubview:main];
main.translatesAutoresizingMaskIntoConstraints = NO;
[main sizeToFit];
main.backgroundColor = [UIColor whiteColor];
top = [UIView new];
[self.contentView addSubview:top];
top.translatesAutoresizingMaskIntoConstraints = NO;
[top sizeToFit];
top.backgroundColor = [UIColor whiteColor];
labelUser = [UILabel new];
[top addSubview:labelUser];
labelUser.translatesAutoresizingMaskIntoConstraints = NO;
[labelUser sizeToFit];
[labelUser setFont:[UIFont systemFontOfSize:14]];
labelUser.textColor = [UIColor colorWithRed:(114.0/255.0) green:(114.0/255.0) blue:(114.0/255.0) alpha:1.0];
labelDate = [UILabel new];
[top addSubview:labelDate];
labelDate.translatesAutoresizingMaskIntoConstraints = NO;
[labelDate sizeToFit];
[labelDate setFont:[UIFont systemFontOfSize:14]];
labelDate.textColor = [UIColor colorWithRed:(114.0/255.0) green:(114.0/255.0) blue:(114.0/255.0) alpha:1.0];
center = [UIView new];
[self.contentView addSubview:center];
center.translatesAutoresizingMaskIntoConstraints = NO;
[center sizeToFit];
center.backgroundColor = [UIColor whiteColor];
imageviewThreadImage = [UIImageView new];
[center addSubview:imageviewThreadImage];
imageviewThreadImage.translatesAutoresizingMaskIntoConstraints = NO;
imageviewThreadImage.backgroundColor = [UIColor colorWithRed:(207.0/255.0) green:(215.0/255.0) blue:(248.0/255.0) alpha:1.0];
[imageviewThreadImage sizeToFit];
labelMessage = [UILabel new];
[center addSubview:labelMessage];
labelMessage.translatesAutoresizingMaskIntoConstraints = NO;
[labelMessage sizeToFit];
[labelMessage setFont:[UIFont systemFontOfSize:14]];
labelMessage.preferredMaxLayoutWidth = screenWidth - 10 - 36;
labelMessage.lineBreakMode = UILineBreakModeWordWrap;
labelMessage.numberOfLines = 0;
labelMessage.textColor = [UIColor lightGrayColor];
//labelMessage.lineBreakMode = UILineBreakModeWordWrap;
bottom = [UIView new];
[self.contentView addSubview:bottom];
bottom.translatesAutoresizingMaskIntoConstraints = NO;
[bottom sizeToFit];
labelCat = [UILabel new];
[bottom addSubview:labelCat];
labelCat.translatesAutoresizingMaskIntoConstraints = NO;
[labelCat sizeToFit];
[labelCat setFont:[UIFont systemFontOfSize:12]];
labelCat.textColor = [UIColor colorWithRed:(58.0/255.0) green:(82.0/255.0) blue:(207.0/255.0) alpha:1.0];
labelCat.lineBreakMode = UILineBreakModeWordWrap;
labelCat.numberOfLines = 0;
return self;
- (void)layoutSubviews
[super layoutSubviews];
// Make sure the contentView does a layout pass here so that its subviews have their frames set, which we
// need to use to set the preferredMaxLayoutWidth below.
[self.contentView setNeedsLayout];
[self.contentView layoutIfNeeded];
// Set the preferredMaxLayoutWidth of the mutli-line bodyLabel based on the evaluated width of the label's frame,
// as this will allow the text to wrap correctly, and as a result allow the label to take on the correct height.
self.labelMessage.preferredMaxLayoutWidth = CGRectGetWidth(self.labelMessage.frame);
- (void)updateConstraints
[super updateConstraints];
if (self.didSetupConstraints) return;
/**NSDictionary *viewsDictionary7 = @@"main":main;
NSArray *constraint_H37 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[main]|"
options:0
metrics:nil
views:viewsDictionary7];
NSArray *constraint_V37 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[main]|"
options:0
metrics:nil
views:viewsDictionary7];
[self.contentView addConstraints:constraint_H37];
[self.contentView addConstraints:constraint_V37];**/
NSString *text = labelMessage.text;
NSDictionary *viewsDictionary3 = @@"top":top,@"center":center,@"bottom":bottom;
NSArray *constraint_H3 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[top]-5-[center(>=50)]-5-[bottom]-10-|"
options:0
metrics:nil
views:viewsDictionary3];
NSArray *constraint_H33 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[top]|"
options:0
metrics:nil
views:viewsDictionary3];
NSArray *constraint_H333 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[center]|"
options:0
metrics:nil
views:viewsDictionary3];
NSArray *constraint_H3335657 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[bottom]|"
options:0
metrics:nil
views:viewsDictionary3];
NSDictionary *viewsDictionary4 = @@"labelUser":labelUser,@"labelDate":labelDate;
NSArray *constraint_H4 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[labelUser]|"
options:0
metrics:nil
views:viewsDictionary4];
NSDictionary *viewsDictionary45 = @@"labelDate":labelDate;
NSArray *constraint_H4555 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[labelDate]|"
options:0
metrics:nil
views:viewsDictionary45];
NSArray *constraint_H44 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[labelUser]-20-[labelDate]-5-|"
options:0
metrics:nil
views:viewsDictionary4];
NSDictionary *viewsDictionary48 = @@"labelMessage":labelMessage,@"imageviewThreadImage":imageviewThreadImage;
NSArray *constraint_H48 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-5-[labelMessage]|"
options:0
metrics:nil
views:viewsDictionary48];
NSArray *constraint_H48342 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[imageviewThreadImage(36)]"
options:0
metrics:nil
views:viewsDictionary48];
NSArray *constraint_H448345fgdfg = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[imageviewThreadImage(36)]-5-[labelMessage]-5-|"
options:0
metrics:nil
views:viewsDictionary48];
/**NSArray *constraint_H448 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[labelMessage]-5-|"
options:0
metrics:nil
views:viewsDictionary48];**/
NSDictionary *viewsDictionary488 = @@"labelCat":labelCat;
NSArray *constraint_H488 = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[labelCat]|"
options:0
metrics:nil
views:viewsDictionary488];
NSArray *constraint_H4488 = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-5-[labelCat]"
options:0
metrics:nil
views:viewsDictionary488];
[self.contentView addConstraints:constraint_H3];
[self.contentView addConstraints:constraint_H33];
[self.contentView addConstraints:constraint_H333];
[self.contentView addConstraints:constraint_H4];
[self.contentView addConstraints:constraint_H44];
[self.contentView addConstraints:constraint_H48];
//[self.contentView addConstraints:constraint_H448];
[self.contentView addConstraints:constraint_H4555];
[self.contentView addConstraints:constraint_H3335657];
[self.contentView addConstraints:constraint_H488];
[self.contentView addConstraints:constraint_H48342];
[self.contentView addConstraints:constraint_H4488];
[self.contentView addConstraints:constraint_H448345fgdfg];
self.didSetupConstraints = YES;
- (CGFloat)heightForText:(NSString *)bodyText
UIFont *cellFont = [UIFont systemFontOfSize:17];
CGSize constraintSize = CGSizeMake(300, MAXFLOAT);
CGSize labelSize = [bodyText sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
CGFloat height = labelSize.height + 10;
return height;
- (void)awakeFromNib
// Initialization code
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
[super setSelected:selected animated:animated];
// Configure the view for the selected state
@end
【讨论】：
如果问题与您不再相关，请接受您的回答并关闭问题。我很高兴你把事情解决了:)【参考方案3】：在 iOS 8 中，您可以使用委托函数来计算单元格大小，如下所示：
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
return UITableViewAutomaticDimension;
确保标签到 contentView 底部之间有底部约束，然后就完成了。
请注意，它仅适用于 iOS 8。
【讨论】：
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