iOS实现自定义导航

#import "ViewController.h"

#import "SubViewController.h"

@interface
ViewController ()<UITableViewDataSource,UITableViewDelegate>

{

   
//存放视图控制器数据源

    NSMutableArray *_vcArray;

   
//存放按钮的数组

    NSMutableArray * _btnsArray;

    UITableView *_tb;

    //头部滚动视图

    UIScrollView *_topScrollView;

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super
viewDidLoad];

    [self
setupTopScroll];

    [self
setupVCArray];

    [self
setupTableView];

}

#define  SWIDTH [UIScreen mainScreen].bounds.size.width

#define SHEIGHT [UIScreen mainScreen].bounds.size.height

-(void)setupTopScroll{

    //不让他自动调整scroll

    _btnsArray = [NSMutableArray
array];

    self.automaticallyAdjustsScrollViewInsets =
NO;

    _topScrollView = [[UIScrollView
alloc]initWithFrame:CGRectMake(0, 64,
SWIDTH, 30)];

    //[self.view addSubview:_topScrollView];

    self.navigationItem.titleView =
_topScrollView;

    

    

    NSArray *titles = @[@"科技",@"博客",@"动态",@"新闻",

                        @"王大",@"王二",@"王三",@"王四",

                        @"王五",@"王六",@"王七",@"王八"

                        ];

    

    for(int i = 0;i < 12;i++){

        UIButton *button = [UIButton
buttonWithType:UIButtonTypeCustom];

        button.frame =
CGRectMake(i*SWIDTH/4, 0,
SWIDTH/4, 30);

        [button setTitle:titles[i]
forState:UIControlStateNormal];

        if (i == 0) {

            [button setTitleColor:[UIColor
colorWithRed:0.8
green:0 blue:0
alpha:1.0] forState:UIControlStateNormal];

        }

        else{

            [button setTitleColor:[UIColor
colorWithRed:0.8
green:0.8 blue:0.8
alpha:1.0] forState:UIControlStateNormal];}

        button.tag = 1000+i;

        [button addTarget:self
action:@selector(changePage:)
forControlEvents:UIControlEventTouchUpInside];

        button.titleLabel.font = [UIFont
systemFontOfSize:14];

        [_topScrollView
addSubview:button];

        [_btnsArray
addObject:button];

    }

    _topScrollView.contentSize =
CGSizeMake(SWIDTH*3, 0);

   

}

//初始化数据源
数据源存放视图控制器

-(void)setupVCArray{

    _vcArray = [[NSMutableArray
alloc]init];;

    for (NSInteger i = 0; i < 12; i++) {

        //此时subVC的view还没有被创建出来，也即是subVC中的viewDidLoad方法不会被执行
如何使用到view viewDidLoad会被立刻执行

        SubViewController *subVC = [[SubViewController
alloc]init];

        subVC.index = i;

        [_vcArray
addObject:subVC];

    }

}

//初始化tableView

-(void)setupTableView{

    _tb= [[UITableView
alloc]init];

    //逆时针旋转90度
让tableView变成横向滚动

    _tb.transform =
CGAffineTransformMakeRotation(-M_PI_2);

    //旋转过后再去设置frame

    _tb.frame =
CGRectMake(0, 94,
SWIDTH, SHEIGHT-94);

    //关闭回弹

    _tb.bounces =
NO;

    _tb.pagingEnabled =
YES;

    //去除分割线

    _tb.separatorStyle =
UITableViewCellSeparatorStyleNone;

    //设置行高

    _tb.rowHeight =
SWIDTH;

    //去除tableView的滚动条

    _tb.showsVerticalScrollIndicator =
NO;

    _tb.delegate =
self;

    _tb.dataSource =
self;

    [self.view
addSubview:_tb];

    [_tb
registerClass:[UITableViewCell
class] forCellReuseIdentifier:@"Cell"];

}

#pragma mark - tableViewDelegate

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return
_vcArray.count;

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath{

    UITableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:@"Cell"
forIndexPath:indexPath];

    //去除cell的选中样式

    cell.selectionStyle =
UITableViewCellSelectionStyleNone;

    cell.transform =
CGAffineTransformMakeRotation(M_PI_2);

    UILabel *label = [[UILabel
alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

    label.text =
@"zhehisdadasd";

    [cell.contentView
addSubview:label];

    //布局cell

    UIViewController *vc =
_vcArray[indexPath.row];

    vc.view.frame = cell.contentView.bounds;

   
//先移除子视图，否则可能出现一个cell上出现了多个视图控制器的view

    [cell.contentView.subviews
makeObjectsPerformSelector:@selector(removeFromSuperview)];

    

    

    [cell.contentView
addSubview:vc.view];

    return cell;

}

//滚动中实时被调用

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

    //tableView 偏移量
横向过来了

    CGFloat offSetY = scrollView.contentOffset.y;

    //每一页偏移量 SWIDTH

    //相对位移CGFloat width = (NSInteger )offSetX%(NSInteger)SWIDTH;

    CGFloat ratio = (NSInteger )offSetY%(NSInteger)SWIDTH/SWIDTH;

    NSLog(@"%f",ratio);

    //当前的页数

    NSInteger curIndex = (offSetY+SWIDTH/2)/SWIDTH;

    NSLog(@"%ld",curIndex);

    //下一页

    //NSInteger nextIndex = ratio<0.5?curIndex+1:curIndex-1;

    

    if (offSetY !=
SWIDTH*curIndex) {

        NSInteger nextIndex= offSetY>curIndex*SWIDTH?curIndex+1:curIndex-1;

        if(curIndex >= nextIndex){

            curIndex = curIndex +nextIndex;

            nextIndex = curIndex -nextIndex;

            curIndex = curIndex -nextIndex;

            

        }

        UIButton *curBtn =
_btnsArray[curIndex];

        UIButton *nextBtn =
_btnsArray[nextIndex];

        [curBtn setTitleColor:[UIColor
colorWithRed:0.8
green:0.8*ratio blue:0.8*ratio
alpha:1.0] forState:UIControlStateNormal];

        [nextBtn setTitleColor:[UIColor
colorWithRed:0.8
green:0.8*(1-ratio) blue:0.8*(1-ratio)
alpha:1.0] forState:UIControlStateNormal];

        curBtn.transform =
CGAffineTransformMakeScale(1+0.2-ratio*0.2, 1+0.2-ratio *0.2);

        nextBtn.transform =
CGAffineTransformMakeScale(1+ratio*0.2, 1+ratio*0.2);

        

    }else{

       
//翻页结束时获取当前页所对应的按钮

        UIButton *btn =
_btnsArray[curIndex];

        //获取按钮中心点坐标

        //CGRectGetMaxX(btn.frame)-SWIDTH/2顶部scroll要偏移的大小

        //_topScrollView.contentSize.width - SWIDTH
顶部scrollview在x轴上偏移的最大值

        if ((CGRectGetMidX(btn.frame)-SWIDTH/2)>(_topScrollView.contentSize.width
- SWIDTH) ) {

            [_topScrollView
setContentOffset:CGPointMake(_topScrollView.contentSize.width
- SWIDTH, 0)
animated:YES];

        }else
if(CGRectGetMidX(btn.frame)>SWIDTH/2){

             [_topScrollView
setContentOffset:CGPointMake(CGRectGetMidX(btn.frame)
-SWIDTH/2, 0)
animated:YES];

            

        }else{

            [_topScrollView
setContentOffset:CGPointMake(0, 0)
animated:YES];

        }

     

    }

    

    //获取产生动画的button

 

}

//停止减速

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

    

}

//停止拖拽

//decelerate为NO是scrollView为静止
不会触发scrollViewDidEndDecelerate

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{

    

}

//-(void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{

//    //即将拖拽结束

//}

#pragma mark - 点击事件

-(void)changePage:(UIButton*)button{

   
//获取当前页的索引

    NSInteger index =
_tb.contentOffset.y/SWIDTH;

    UIButton *curBtn =
_btnsArray[index];

    [curBtn setTitleColor:[UIColor
colorWithRed:0.8
green:0.8 blue:0.8
alpha:1.0] forState:UIControlStateNormal];

    

    [button setTitleColor:[UIColor
colorWithRed:0.8
green:0 blue:0
alpha:1.0] forState:UIControlStateNormal];

    //让tableView滚动到这个页面

    //btn在数组中的索引

    [_tb
setContentOffset:CGPointMake(0,SWIDTH*(button.tag
- 1000)) animated:NO];

    //_tb.contentOffset = CGPointMake(SWIDTH*(button.tag - 1000), 0);

}

- (void)didReceiveMemoryWarning {

    [super
didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end