按单词包装 UILabel 并以编程方式扩展 UITableViewCell 高度
Wrap UILabel by word and expand UITableViewCell height programmatically
我以编程方式创建布局约束以在 table 单元格中排列 UI 组件。
以下是我正在实施的限制条件:
- 单元格的左侧部分包含
nameUIView
(完成)
- 单元格的右侧部分包含
valueUIView
(完成)
nameUIView
和 valueUIView
部分的宽度应该相等(完成)
- 高度和宽度
nameUIView
和 valueUIView
应该是可用的 100% space(完成)
nameUIView
包含一个 nameUILabel
(完成)
nameUILabel
应该使用单词换行(需要建议)
- 如果
nameUILabel
中的文本变得太大,UITableViewCell 单元格的高度应该扩展(需要建议)
如何以编程方式实现该布局的换行和高度扩展?
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
NSString *reuseID = reuseIdentifier;
// The view containing the label (left, red)
UIView *nameUIView = [[UIView alloc] init];
self.nameUIView = attributeNameView;
[self.nameUIView setBackgroundColor:[UIColor redColor]];
[self.nameUIView setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.contentView addSubview:self.nameUIView];
// The label (green)
UILabel *nameUILabel = [[UILabel alloc] init];
self.nameUILabel = nameUILabel;
[self.nameUILabel setTextColor:[UIColor blackColor]];
[self.nameUILabel setBackgroundColor:[UIColor greenColor]];
[self.nameUILabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.nameUILabel setLineBreakMode:NSLineBreakByWordWrapping];
[self.nameUIView addSubview:self.nameUILabel];
// The view containing the value (right, blue)
UIView *valueUIView = [[UIView alloc] init];
self.valueUIView = valueUIView;
[self.valueUIView setBackgroundColor:[UIColor blueColor]];
[self.valueUIView setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.contentView addSubview:self.valueUIView];
NSDictionary *views = NSDictionaryOfVariableBindings(nameUIView, nameUILabel, valueUIView);
NSArray *constraints;
// The constraint to align the views horizonzally (1:1) sizing
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[nameUIView][valueUIView(==nameUIView)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
// 100% height for name view
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[nameUIView]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
NSLayoutConstraint *constraint;
// Center name label horizontally
constraint = [NSLayoutConstraint constraintWithItem:nameUILabel
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:nameUIView
attribute:NSLayoutAttributeCenterX
multiplier:1.f constant:0.f];// Not possible via VFL
[self.contentView addConstraint:constraint];
// Center name label vertically
constraint = [NSLayoutConstraint constraintWithItem:nameUILabel
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:nameUIView
attribute:NSLayoutAttributeCenterY
multiplier:1.f constant:0.f];// Not possible via VFL
[self.contentView addConstraint:constraint];
// 100% height for value view
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[valueUIView]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
}
return self;
}
- 按单词换行
添加此附加约束(将标签的宽度设置为父视图)确实启用了自动换行:
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[attributeNameLabel(==attributeNameView)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
最后,我不得不将文本居中:
[self.attributeNameLabel setTextAlignment:NSTextAlignmentCenter];
- 根据内容扩展单元格高度
UITableView也需要设置这些属性
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight =
将包装父视图的高度设置为它包含的标签
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[nameUIView(==nameUILabel)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
最小高度限制(可选)
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[nameUIView(>=50)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
我以编程方式创建布局约束以在 table 单元格中排列 UI 组件。
以下是我正在实施的限制条件:
- 单元格的左侧部分包含
nameUIView
(完成) - 单元格的右侧部分包含
valueUIView
(完成) nameUIView
和valueUIView
部分的宽度应该相等(完成)- 高度和宽度
nameUIView
和valueUIView
应该是可用的 100% space(完成) nameUIView
包含一个nameUILabel
(完成)nameUILabel
应该使用单词换行(需要建议)- 如果
nameUILabel
中的文本变得太大,UITableViewCell 单元格的高度应该扩展(需要建议)
如何以编程方式实现该布局的换行和高度扩展?
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
NSString *reuseID = reuseIdentifier;
// The view containing the label (left, red)
UIView *nameUIView = [[UIView alloc] init];
self.nameUIView = attributeNameView;
[self.nameUIView setBackgroundColor:[UIColor redColor]];
[self.nameUIView setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.contentView addSubview:self.nameUIView];
// The label (green)
UILabel *nameUILabel = [[UILabel alloc] init];
self.nameUILabel = nameUILabel;
[self.nameUILabel setTextColor:[UIColor blackColor]];
[self.nameUILabel setBackgroundColor:[UIColor greenColor]];
[self.nameUILabel setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.nameUILabel setLineBreakMode:NSLineBreakByWordWrapping];
[self.nameUIView addSubview:self.nameUILabel];
// The view containing the value (right, blue)
UIView *valueUIView = [[UIView alloc] init];
self.valueUIView = valueUIView;
[self.valueUIView setBackgroundColor:[UIColor blueColor]];
[self.valueUIView setTranslatesAutoresizingMaskIntoConstraints:NO];
[self.contentView addSubview:self.valueUIView];
NSDictionary *views = NSDictionaryOfVariableBindings(nameUIView, nameUILabel, valueUIView);
NSArray *constraints;
// The constraint to align the views horizonzally (1:1) sizing
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[nameUIView][valueUIView(==nameUIView)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
// 100% height for name view
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[nameUIView]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
NSLayoutConstraint *constraint;
// Center name label horizontally
constraint = [NSLayoutConstraint constraintWithItem:nameUILabel
attribute:NSLayoutAttributeCenterX
relatedBy:NSLayoutRelationEqual
toItem:nameUIView
attribute:NSLayoutAttributeCenterX
multiplier:1.f constant:0.f];// Not possible via VFL
[self.contentView addConstraint:constraint];
// Center name label vertically
constraint = [NSLayoutConstraint constraintWithItem:nameUILabel
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:nameUIView
attribute:NSLayoutAttributeCenterY
multiplier:1.f constant:0.f];// Not possible via VFL
[self.contentView addConstraint:constraint];
// 100% height for value view
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[valueUIView]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
}
return self;
}
- 按单词换行
添加此附加约束(将标签的宽度设置为父视图)确实启用了自动换行:
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|[attributeNameLabel(==attributeNameView)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
最后,我不得不将文本居中:
[self.attributeNameLabel setTextAlignment:NSTextAlignmentCenter];
- 根据内容扩展单元格高度
UITableView也需要设置这些属性
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight =
将包装父视图的高度设置为它包含的标签
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[nameUIView(==nameUILabel)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];
最小高度限制(可选)
constraints = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|[nameUIView(>=50)]|"
options: 0
metrics:nil
views:views];
[self.contentView addConstraints:constraints];