这个简易 的底部拖拉菜单没什么工作量，这里氷分析了，直接上代码，距离属性没剥离出来，不过很简单，各位大神用到的时候，自己扩展吧
代码如下：
@interface ViewController ()
@property(nonatomic,strong) UIView* bottomView;
@property(nonatomic, strong) NSLayoutConstraint *bottomHeightCons;
@property(nonatomic,assign) CGPoint startPos;
@property(nonatomic,assign) CGPoint endPos;
@property(nonatomic,assign) CGPoint originPos;
@property(nonatomic,assign) BOOL bIsDirectionDowm;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self initView];
}
-(void) initView{
self.bottomView = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.frame.size.height - 100,
self.view.frame.size.width, 300)];
self.bottomView.backgroundColor = [UIColor greenColor];
self.bottomView.translatesAutoresizingMaskIntoConstraints = NO;
UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(100, self.bottomView.frame.size.height - 80, 160, 40)];
label.text = @"底部隐藏菜单";
[self.bottomView addSubview:label];
[self.view addSubview:self.bottomView];
self.originPos = self.bottomView.center;
self.bIsDirectionDowm = false;
}
-(void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
self.startPos = [touch locationInView:self.view];
}
-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint curP = [touch locationInView:self.view];
if(curP.y - self.startPos.y <= 0 && curP.y - self.startPos.y >= -200){ //向上滑
if(self.bIsDirectionDowm) return;
self.bottomView.center = CGPointMake(self.bottomView.center.x, self.originPos.y + ( curP.y - self.startPos.y));
}else if(curP.y - self.startPos.y > 0 && curP.y - self.startPos.y <= 100){ //向下滑动
if(!self.bIsDirectionDowm) return;
self.bottomView.center = CGPointMake(self.bottomView.center.x, self.originPos.y - 100 + ( curP.y - self.startPos.y));
}
}
//当手指离开屏幕时调用
-(void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
self.endPos = [touch locationInView:self.view];
if(self.endPos.y - self.startPos.y <= 0 && self.endPos.y - self.startPos.y >= -100){ //向上滑动
[UIView animateWithDuration:0.3 animations:^{
self.bottomView.center = CGPointMake(self.bottomView.center.x, self.view.frame.size.height - self.bottomView.frame.size.height / 2);
self.bIsDirectionDowm = true;
}];
}
else if(self.endPos.y - self.startPos.y >= 0 && self.endPos.y - self.startPos.y <= 100){
[UIView animateWithDuration:0.1 animations:^{
self.bottomView.center = CGPointMake(self.bottomView.center.x, self.originPos.y);
self.bIsDirectionDowm = false;
}];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}