iOS实现应用悬浮窗效果

本文实例为大家分享了ios实现应用悬浮窗效果的具体代码，供大家参考，具体内容如下

需求

在一个app应用的最顶部添加一个悬浮窗，就像ios系统assistivetouch 可以左右滑动，但是最终会停在左边或右边。

实现思路

在应用的视图的最顶层添加一个uiwindow，用这个uiwindow 充当悬浮窗，给uiwindow添加移动的手势监听，让悬浮窗随着手指移动，释放的时候，让它以动画的方式靠边

代码

//悬浮窗测试
//创建一个悬浮窗口
mwindow = [[assistivetouch alloc]initwithframe:cgrectmake(100, 200, 40, 40) imagename:@"1.png"];
//ios9 window要设置rootview 不然崩溃
uiviewcontroller *controller = [[uiviewcontroller alloc] init];
mwindow.rootviewcontroller = controller;
//展示悬浮窗。。
[self.window makekeyandvisible];

//添加移动的手势
uipangesturerecognizer *pan = [[uipangesturerecognizer alloc]initwithtarget:self action:@selector(locationchange:)];
 pan.delaystouchesbegan = yes;
 [self addgesturerecognizer:pan];

//改变位置
-(void)locationchange:(uipangesturerecognizer*)p
{
    //[[uiapplication sharedapplication] keywindow]
    cgpoint panpoint = [p locationinview:[[uiapplication sharedapplication] keywindow]];
    if(p.state == uigesturerecognizerstatebegan)
    {
        [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(changecolor) object:nil];
        _imageview.alpha = 0.8;
    }
    else if (p.state == uigesturerecognizerstateended)
    {
        [self performselector:@selector(changecolor) withobject:nil afterdelay:4.0];
    }
    if(p.state == uigesturerecognizerstatechanged)
    {
        self.center = cgpointmake(panpoint.x, panpoint.y);
    }
    else if(p.state == uigesturerecognizerstateended)
    {
        if(panpoint.x <= kscreenwidth/2)
        {
            if(panpoint.y <= 40+height/2 && panpoint.x >= 20+width/2)
            {
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(panpoint.x, height/2);
                }];
            }
            else if(panpoint.y >= kscreenheight-height/2-40 && panpoint.x >= 20+width/2)
            {
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(panpoint.x, kscreenheight-height/2);
                }];
            }
            else if (panpoint.x < width/2+15 && panpoint.y > kscreenheight-height/2)
            {
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(width/2, kscreenheight-height/2);
                }];
            }
            else
            {
                cgfloat pointy = panpoint.y < height/2 ? height/2 :panpoint.y;
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(width/2, pointy);
                }];
            }
        }
        else if(panpoint.x > kscreenwidth/2)
        {
            if(panpoint.y <= 40+height/2 && panpoint.x < kscreenwidth-width/2-20 )
            {
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(panpoint.x, height/2);
                }];
            }
            else if(panpoint.y >= kscreenheight-40-height/2 && panpoint.x < kscreenwidth-width/2-20)
            {
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(panpoint.x, 480-height/2);
                }];
            }
            else if (panpoint.x > kscreenwidth-width/2-15 && panpoint.y < height/2)
            {
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(kscreenwidth-width/2, height/2);
                }];
            }
            else
            {
                cgfloat pointy = panpoint.y > kscreenheight-height/2 ? kscreenheight-height/2 :panpoint.y;
                [uiview animatewithduration:0.2 animations:^{
                    self.center = cgpointmake(320-width/2, pointy);
                }];
            }
        }
    }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。