iOS抽屉效果开发案例分享

2020-07-26 03:23:05

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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：