iOS仿新闻tab标题栏效果-创新互联
iOS仿网易新闻之类的滑动标题栏，供大家参考，具体内容如下
预览
思路
两个scorllview，一个用于标题栏，一个拥有底下的page
标题栏文字和效果切换，渐变色和大小都是根据底下的page偏移量来归一化换算的
小横线直接加载标题栏所在的scorllview里面，小横线自身要有局部偏移，根据page来切换
标题栏的居中需要算一个scrollview的偏移量，小横线跟着scorllview偏移
监听scrollview的滑动和停止滑动进行相应的处理
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self createTitleScrollView];
[self createButtonLine];
[self createContentScrollview];
}
#pragma mark - 初始化UI
- (void)createTitleScrollView
{
// 根据是否有导航栏调整坐标
CGFloat marginY = self.navigationController ? self.navigationController.view.frame.size.height : kUpMargin;
// 标题栏,包括小横线的位置
_titleScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, marginY, kFrameWidth, kTitleHeight + kButtonLineHeight)];
_titleScrollView.showsHorizontalScrollIndicator = NO;
_titleScrollView.bounces = NO;
_titleScrollView.delegate = self;
[self.view addSubview:_titleScrollView];
// 添加button
NSArray *titleArray = @[@"头条", @"社会", @"财经", @"科技", @"体育", @"娱乐", @"时尚", @"军事", @"教育", @"游戏"];
_pageCount = titleArray.count;
_titleScrollView.contentSize = CGSizeMake(kButtonWidth * _pageCount, kTitleHeight);
for (int i = 0; i < _pageCount; i++)
{
UIButton *titleBtn = [[UIButton alloc] initWithFrame:CGRectMake(kButtonWidth * i, 0, kButtonWidth, kTitleHeight)];
[titleBtn setTitle:titleArray[i] forState:UIControlStateNormal];
[titleBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
titleBtn.titleLabel.font = [UIFont systemFontOfSize:16];
[titleBtn addTarget:self action:@selector(titleButtonClicked:) forControlEvents:UIControlEventTouchDown];
titleBtn.tag = 1000 + i; // button做标记，方便后面索引，为了不出冲突，就把这个数值设得大一些
[_titleScrollView addSubview:titleBtn];
};
}
- (void)createButtonLine
{
// 初始时刻停在最左边与按钮对齐
_buttonLine = [[UIView alloc] initWithFrame:CGRectMake(0, kTitleHeight, kButtonWidth, kButtonLineHeight)];
_buttonLine.backgroundColor = [UIColor redColor];
// 小横线加载scrollview上才能跟随button联动
[_titleScrollView addSubview:_buttonLine];
}
- (void)createContentScrollview
{
CGFloat marginY = self.navigationController ? self.navigationController.view.frame.size.height : kUpMargin;
// 添加内容页面
_contentScrollview = [[UIScrollView alloc] initWithFrame:CGRectMake(0, marginY + kTitleHeight + kButtonLineHeight, kFrameWidth, kFrameHeight - marginY - kTitleHeight - kButtonLineHeight)];
_contentScrollview.pagingEnabled = YES;
_contentScrollview.bounces = NO;
_contentScrollview.contentSize = CGSizeMake(kFrameWidth * _pageCount, kFrameHeight - marginY - kTitleHeight);
_contentScrollview.showsHorizontalScrollIndicator = NO;
_contentScrollview.delegate = self;
[self.view addSubview:_contentScrollview];
// 添加分页面
for (int i = 0; i < _pageCount; i++)
{
PageViewController *pageViewController = [[PageViewController alloc] init];
UIButton *button = [_titleScrollView viewWithTag:1000 + i];
pageViewController.title = button.currentTitle;
pageViewController.view.frame = CGRectMake(kFrameWidth * i, 0, kFrameWidth, kFrameHeight - marginY - kTitleHeight);
[_contentScrollview addSubview:pageViewController.view];
}
// 初始化后选中某个栏目
[self titleButtonClicked:[_titleScrollView viewWithTag:1000 + 0]];
}
#pragma mark - 标题button点击事件
- (void)titleButtonClicked:(UIButton *)sender
{
// 根据点击的button切换页面和偏移
printf("%s clicked\n", sender.currentTitle.UTF8String);
// 以下不用了，因为scroll切换会自动处理好尺寸和颜色了
// for (int i = 0; i < _pageCount; i++)
// {
// UIButton *button = [_titleScrollView viewWithTag:1000 + i];
// // 重置button尺寸颜色
// button.transform = CGAffineTransformMakeScale(1, 1);
// [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
// }
// 强调被选中的button
// 放大聚焦
sender.transform = CGAffineTransformMakeScale(kMaxTitleScale, kMaxTitleScale);
// 变色
[sender setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
// 居中title
[self settleTitleButton:sender];
// 带动画切换到对应的内容,会触发scrollViewDidScroll
NSInteger pageIndex = sender.tag - 1000;
[_contentScrollview setContentOffset:CGPointMake(kFrameWidth * pageIndex, 0) animated:YES];
}
#pragma mark - scrollview滑动事件
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// 根据content内容偏移调整标题栏
if (scrollView == _titleScrollView)
{
printf("title moved\n");
}
else if (scrollView == _contentScrollview)
{
printf("content moved\n");
// 获得左右两个button的索引, 注意最后取整
CGFloat offsetX = scrollView.contentOffset.x;
NSInteger leftTitleIndex = offsetX / kFrameWidth;
NSInteger rightTitleIndex = leftTitleIndex + 1;
// 因为设置了到边不能滑动，所以不考虑边界
UIButton *leftTitleButton = [_titleScrollView viewWithTag:1000 + leftTitleIndex];
UIButton *rightTitleButton = [_titleScrollView viewWithTag:1000 + rightTitleIndex];
// 设置大小和颜色渐变以及小横线的联动
// 权重因子 0~1 小数, 左边和右边互补
CGFloat rightTitleFactor = offsetX / kFrameWidth - leftTitleIndex;
CGFloat leftTitleFactor = 1 - rightTitleFactor;
// 尺寸
CGFloat maxExtraScale = kMaxTitleScale - 1;
leftTitleButton.transform = CGAffineTransformMakeScale(1 + leftTitleFactor * maxExtraScale, 1 + leftTitleFactor * maxExtraScale);
rightTitleButton.transform = CGAffineTransformMakeScale(1 + rightTitleFactor * maxExtraScale, 1 + rightTitleFactor * maxExtraScale);
// 颜色
UIColor *leftTitleColor = [UIColor colorWithRed:0 green:leftTitleFactor blue:0 alpha:1];
UIColor *rightTitleColor = [UIColor colorWithRed:0 green:rightTitleFactor blue:0 alpha:1];
[leftTitleButton setTitleColor:leftTitleColor forState:UIControlStateNormal];
[rightTitleButton setTitleColor:rightTitleColor forState:UIControlStateNormal];
// 小横线位移
_buttonLine.frame = CGRectMake(kButtonWidth * (leftTitleIndex + rightTitleFactor), _buttonLine.frame.origin.y, kButtonWidth, kButtonLineHeight);
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
// 内容区块滑动结束调整标题栏居中
if (scrollView == _contentScrollview)
{
// 取得索引值
NSInteger titleIndex = scrollView.contentOffset.x / kFrameWidth;
// title居中
[self settleTitleButton:[_titleScrollView viewWithTag:1000 + titleIndex]];
}
}
#pragma mark - 标题按钮和横线居中偏移
- (void)settleTitleButton:(UIButton *)button
{
// 标题
// 这个偏移量是相对于scrollview的content frame原点的相对对标
CGFloat deltaX = button.center.x - kFrameWidth / 2;
// 设置偏移量，记住这段算法
if (deltaX < 0)
{
// 最左边
deltaX = 0;
}
CGFloat maxDeltaX = _titleScrollView.contentSize.width - kFrameWidth;
if (deltaX > maxDeltaX)
{
// 最右边不能超范围
deltaX = maxDeltaX;
}
[_titleScrollView setContentOffset:CGPointMake(deltaX, 0) animated:YES];
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