我正在iOS上创建一个图片轮询应用。 Feed将是与发布图像类似的条目实例(无边框)。我使用PureLayout创建了一个自定义UITableViewCell
。但是,图像(异步加载)不会显示。
我在图像完成处理程序中尝试了invalidateIntrinsicContentSize
之类的内容但是没有用。我是AutoLayout的新手,我正在关注此sample code
以下是我对图像的约束设置和2个顶部标签
- (void) updateConstraints {
if (!self.didSetupConstraints) {
self.contentView.bounds = CGRectMake(0.0f, 0.0f, 99999.0f, 99999.0f);
[NSLayoutConstraint autoSetPriority:UILayoutPriorityRequired forConstraints:^{
[self.questionLabel autoSetContentCompressionResistancePriorityForAxis:ALAxisVertical];
}];
[self.questionLabel autoPinEdgeToSuperviewEdge:ALEdgeTop withInset:kLabelVerticalInsets];
[self.questionLabel autoPinEdgeToSuperviewEdge:ALEdgeLeading withInset:kLabelHorizontalInsets];
[self.questionLabel autoPinEdgeToSuperviewEdge:ALEdgeTrailing withInset:kLabelHorizontalInsets];
[self.nameLabel autoPinEdge:ALEdgeTop toEdge:ALEdgeBottom ofView:self.questionLabel withOffset:kLabelVerticalInsets];
[NSLayoutConstraint autoSetPriority:UILayoutPriorityRequired forConstraints:^{
[self.nameLabel autoSetContentCompressionResistancePriorityForAxis:ALAxisVertical];
}];
[self.nameLabel autoPinEdgeToSuperviewEdge:ALEdgeLeading withInset:kLabelHorizontalInsets];
[self.nameLabel autoPinEdgeToSuperviewEdge:ALEdgeTrailing withInset:kLabelHorizontalInsets];
[self.nameLabel autoPinEdgeToSuperviewEdge:ALEdgeBottom withInset:kLabelVerticalInsets];
[NSLayoutConstraint autoSetPriority:UILayoutPriorityRequired forConstraints:^{
[self.mainImageView autoSetContentCompressionResistancePriorityForAxis:ALAxisVertical];
}];
[self.mainImageView autoPinEdge:ALEdgeTop toEdge:ALEdgeBottom ofView:self.nameLabel withOffset:kLabelVerticalInsets];
[self.mainImageView autoPinEdgeToSuperviewEdge:ALEdgeLeft withInset:0];
[self.mainImageView autoPinEdgeToSuperviewEdge:ALEdgeRight withInset:0];
[self.mainImageView autoPinEdgeToSuperviewEdge:ALEdgeBottom withInset:0];
self.didSetupConstraints = YES;
}
[super updateConstraints];
}