iOS Objective-c实现左右滑动切换页面

本文实例为大家分享了iOSObjective-c实现左右滑动切换页面的具体代码，供大家参考，具体内容如下ScrollView+n个view1.storyboard布局一个ScrollView2....

本文实例为大家分享了IOS Objective-c实现左右滑动切换页面的具体代码，供大家参考，具体内容如下

ScrollView + n个view

1.storyboard布局一个ScrollView

2.拖出两个编程输出口，定义三个属性

@property (weak, nonatomic) IBOutlet UIScrollView *XMScrollView;
@property (weak, nonatomic) IBOutlet UIView *scrollContentView;


///第一次按下
@property (nonatomic) BOOL isBeginScroll;
///开始结束滑动scroll动画
@property (nonatomic) BOOL ipythonsBeginAnimationScroll;
android///开始坐标
@property (nonatomic) NSInteger beginX;

3.在viewDidAppear中重新设置scrollContentView的布局宽和tableVIew大小和位置

///遍历布局
  for (NSLayoutConstandroidraint *constraint in self.scrollContentView.constraints) {
   ///判断布局是不是自己想要的 NSLayoutAttribute类型
    if (constraint.firstAttribute == NSLayoutAttributeWidth) {
     
      [constraint setConstant:self.view.frame.size.width*3];
     
    }
  
  }

 [self.tableView1 setFrame:CGRectMake(0, 0, self.view.frame.size.width, scrollViewContentViewFrame.size.height)];
     
 [self.tableView2 setFrame:CGRectMake(self.view.frame.size.width, 0, self.view.frame.size.width, scrollViewContentViewFrame.size.height)];
     
 [self.tableView3 setFrame:CGRectMake(self.view.frame.size.width*2, 0, self.view.frame.size.width, scrollViewContentViewFrame.size.height)];

4.添加scrollView的代理方法

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
  ///开始滑动scrollView
  self.isBeginScroll = YES;

  ///开始滑动scrollView的位置
  self.beginX = scrollView.contentOffset.x;;

}

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{
  ///停下自动滑动scrollView
  [self.XMScrollView setContentOffset:CGPointZero animated:YES];
  ///结束滑动scrollView
  self.isBeginScroll = NO;
  ///开始滑动动画
  self.isBeginAnimationScroll = YES;
 
}

///结束滑动动画
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
 
  if (self.isBeginAnimationScroll) {
   
    CGFloat currentX = scrollView.contentOffset.x;
   
    NSInteger page = currentX/self.view.frame.size.width;
    ///判断到哪一页了,加载数据
    switch (page) {
       
      case 0:
       

        break;
       
      case 1:
       

        break;
       
      case 2:
       
 
        break;
       
      default:
       
        break;
       
    }
   
  }
 
  self.isBeginAnimationScroll = NO;

}

5.在viewDidLoad中添加监听

///页面切换ScrollView
  self.XMScrollView.delegate = self;
 
  [self addObserver:self forKeyPath:@"isBeginScroll" options:NSKeyValueObservingOptionNew context:nil];

6.通过监听实现滑动结束后自动滑动

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{

  if (!self.isBeginScroll) {
   
    CGFloat offSetX = self.XMScrollView.contentOffset.x;
   
    NSInteger scale = (int)(offSetX/self.view.frame.size.width);
 
    if (offSetX >= self.beginX) {

        [self.XMScrollView setContentOffset:CGPointMake((scale+1)*self.view.frame.size.width, 0) animated:YES];
 
    }
   
    if (offSetX < self.beginX) {
     
      if (self.beginX >= self.view.frame.size.width){
   
        [self.XMScrollView setContentOffset:CGPointMake((scale)*self.view.frame.size.width, 0) animated:YES];

      }
     
    }
   
  }
 
}

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