1UIScrollView添加AutoLayout約束的坑

綜上所屬：
scrollView內(nèi)部的子控件的約束必須完整

代碼如下:

- (UIScrollView *)hScrollerView{
    if (!_hScrollerView) {
        _hScrollerView = [[UIScrollView alloc] init];
        _hScrollerView.pagingEnabled = YES;
        _hScrollerView.showsHorizontalScrollIndicator = YES;
    }
    return _hScrollerView;
}

添加約束：

    [self.hScrollerView addSubview:self.passwordLoginBackView];
    [self.hScrollerView addSubview:self.noPasswordLoginBackView];

      [self.hScrollerView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.segement.mas_bottom);
        make.left.right.bottom.equalTo(self);
    }];

    [self.passwordLoginBackView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.bottom.left.equalTo(self.hScrollerView);
        make.width.height.equalTo(self.hScrollerView);
    }];
    [self.noPasswordLoginBackView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.passwordLoginBackView.mas_right);
        make.top.right.bottom.equalTo(self.hScrollerView);
        make.width.height.equalTo(self.hScrollerView);
    }];

并不需要聲明contentsize屬性，scrollerview確實是可以滑動的～

豎直方向只需要一條完整的貫穿上下的約束即可

水平方向只需要一條完整的貫穿左右的約束即可