iOS抽屉效果开发案例分享

本文实例为大家分享了iOS抽屉效果开发实例，供大家参考，具体内容如下

在显示在窗口的控制器上添加三个view（如果只需要往一边滑动就只加2个view）

先声明三个view

#import "ViewController.h"

@interface ViewController ()
@property(nonatomic, weak) UIView *mainV;
@property(nonatomic, weak) UIView *leftV;
@property(nonatomic, weak) UIView *rightV;
@end

添加view到控制器view上

#pragma mark - 添加子控件
- (void)setUpChildViews {

  UIView *leftV = [[UIView alloc]initWithFrame:self.view.bounds];

  leftV.backgroundColor = [UIColor orangeColor];

  [self.view addSubview:leftV];

  _leftV = leftV;

  UIView *rightV = [[UIView alloc]initWithFrame:self.view.bounds];

  rightV.backgroundColor = [UIColor groupTableViewBackgroundColor];

  [self.view addSubview:rightV];

  _rightV = rightV;

  UIView *mainV = [[UIView alloc]initWithFrame:self.view.bounds];

  mainV.backgroundColor = [UIColor yellowColor];

  [self.view addSubview:mainV];

  _mainV = mainV;
}

- (void)viewDidLoad {
  [super viewDidLoad];

  //添加子控件
  [self setUpChildViews];

  //添加Pan手势
  UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];

  [self.view addGestureRecognizer:pan];

  //添加点按手势，在主视图上任意位置点击回到屏幕开始位置
  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap)];

  [self.view addGestureRecognizer:tap];

}

#pragma mark - 手势识别方法
#define targetL -230
#define targetR 200
#define screenW [UIScreen mainScreen].bounds.size.width
- (void)pan:(UIPanGestureRecognizer *)pan {

  //获取手势移动的位置
  CGPoint tranP = [pan translationInView:self.view];

  //获取x的偏移量
  CGFloat offsetX = tranP.x;

  //修改mainV的frame
  _mainV.frame = [self frameWithOffsetX:offsetX];

  //判断mainV的x是否大于0
  [self observeValueForKeyPath:nil ofObject:nil change:nil context:nil];

  //复位
  [pan setTranslation:CGPointZero inView:self.view];

  //判断当手势结束的时候，定位
  if (pan.state == UIGestureRecognizerStateEnded) {

    CGFloat target = 0;

    if (_mainV.frame.origin.x > screenW * 0.5) {
      //定位到右边
      target = targetR;
    }else if(CGRectGetMaxX(_mainV.frame) < screenW * 0.5) {
      //定位到左边
      target = targetL;
    }

    //获取X轴需要移动的偏移量
    CGFloat offsetX = target - _mainV.frame.origin.x;

    [UIView animateWithDuration:0.25 animations:^{

      _mainV.frame = target == 0 ? self.view.bounds : [self frameWithOffsetX:offsetX];

    }];

  }

}

- (void)tap {

  [UIView animateWithDuration:0.25 animations:^{
    _mainV.frame = self.view.bounds;
  }];

}

#define kMaxY 80
#pragma mark - 根据offsetX计算mainV的frame
- (CGRect)frameWithOffsetX:(CGFloat)offsetX {

  //获取上一次的frame
  CGRect frame = _mainV.frame;

  //获取屏幕的高度
  CGFloat screenH = [UIScreen mainScreen].bounds.size.height;

  //获取屏幕的宽度
  //CGFloat screenW = [UIScreen mainScreen].bounds.size.width;

  //X轴平移一点对应Y轴需要平移的距离
  CGFloat offsetY = offsetX * kMaxY / screenW;

  //获取上一次的高度
  CGFloat preH = frame.size.height;

  //获取上一次的宽度
  CGFloat preW = frame.size.width;

  //获取当前高度
  CGFloat curH = preH - 2 * offsetY;
  //如果是向左滑动
  if(frame.origin.x < 0) {
    curH = preH + 2 * offsetY;
  }

  //获取尺寸的缩放比例
  CGFloat scale = curH / preH;

  //获取当前宽度
  CGFloat curW = preW * scale;

  //获取当前x
  frame.origin.x += offsetX;

  //获取当前y
  CGFloat y = (screenH - curH) / 2;
  frame.origin.y = y;

  frame.size.width = curW;
  frame.size.height = curH;

  return frame;

}

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

  if(_mainV.frame.origin.x > 0) {//往右边滑动
    _rightV.hidden = YES;
  }else if(_mainV.frame.origin.x < 0) {//往左边滑动
    _rightV.hidden = NO;
  }

}

如果想要在mainV主视图中显示tableView，就新创建一个TableViewController，在这里面显示tableView的数据，

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

  return 30;
}

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

  static NSString *ID = @"cell";

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];

  if(cell == nil) {
    cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
  }

  cell.textLabel.text = [NSString stringWithFormat:@"第%ld行", indexPath.row];

  return cell;
}

再创建一个在storyboard中显示的控制器XXMainViewController，继承自实现了抽屉效果的ViewController，并且在storyboard中将class改为这个控制的类名，还要将显示tableView的控制成为他的子控制器

- (void)viewDidLoad {
  [super viewDidLoad];

  XXViewController *vc = [[XXViewController alloc]init];
  vc.view.frame = self.view.bounds;

  //让vc成为主视图控制器的子控制器
  [self addChildViewController:vc];

  //主视图展示tableView
  [self.mainV addSubview:vc.view];

}

为了在XXMainViewController中只能访问mainV而不能修改他的值，所以将子控件的view暴露在ViewController.h中，并添加read-only

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
@property(nonatomic, weak, readonly) UIView *mainV;
@property(nonatomic, weak, readonly) UIView *leftV;
@property(nonatomic, weak, readonly) UIView *rightV;
@end

运行效果图：

以上就是本文的全部内容，希望对大家学习iOS程序设计有所帮助。