使用scrollView的一个子视图对contentSize进行调整
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_scroll_Bg = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 100, SCREEN_W, 200)];
_scroll_Bg.pagingEnabled = YES;
_scroll_Bg.delegate = self;
_scroll_Bg.backgroundColor = [UIColor redColor];
[self.view addSubview:_scroll_Bg];
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1，现在scrollView添加一个主要子视图，大小贴合scrollView
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UIView *bgView = [[UIView alloc] init];
bgView.backgroundColor = [UIColor blueColor];
[_scroll_Bg addSubview:bgView];
[bgView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.left.bottom.and.right.equalTo(_scroll_Bg).with.insets(UIEdgeInsetsZero);
make.width.equalTo(_scroll_Bg);
}];
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2，此后所有子视图都需添加在此bgView上
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UIView *childV = [[UIView alloc] init];
childV.backgroundColor = [UIColor cyanColor];
[bgView addSubview:childV];
[childV mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.right.mas_equalTo(0);
make.top.mas_equalTo(250);
make.height.mas_equalTo(1000);
}];
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3，以最后所加子视图为准，再对bgView进行重新约束
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[bgView mas_makeConstraints:^(MASConstraintMaker *make) {
make.bottom.equalTo(childV.mas_bottom);
}];
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