相关疑难解决方法(0)

我正在尝试将自动布局合并到我的UITableViewHeaderFooterView子类中.这个课程非常基础,只有两个标签.这是完整的子类:

@implementation MBTableDetailStyleFooterView

static void MBTableDetailStyleFooterViewCommonSetup(MBTableDetailStyleFooterView *_self) {
    UILabel *rightLabel = [[UILabel alloc] init];
    _self.rightLabel = rightLabel;
    rightLabel.translatesAutoresizingMaskIntoConstraints = NO;
    [_self.contentView addSubview:rightLabel];

    UILabel *leftLabel = [[UILabel alloc] init];
    _self.leftLabel = leftLabel;
    leftLabel.translatesAutoresizingMaskIntoConstraints = NO;
    [_self.contentView addSubview:leftLabel];

    NSDictionary *views = NSDictionaryOfVariableBindings(rightLabel, leftLabel);

    NSArray *horizontalConstraints = [NSLayoutConstraint constraintsWithVisualFormat:@"|-10-[leftLabel]-(>=10)-[rightLabel]-10-|" options:0 metrics:nil views:views];
    [_self.contentView addConstraints:horizontalConstraints];

    // center views vertically in super view
    NSLayoutConstraint *leftCenterYConstraint = [NSLayoutConstraint constraintWithItem:leftLabel attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:_self.contentView attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
    [_self.contentView addConstraint:leftCenterYConstraint];
    NSLayoutConstraint *rightCenterYConstraint = [NSLayoutConstraint constraintWithItem:rightLabel attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:_self.contentView attribute:NSLayoutAttributeCenterY …