游戏联运系统SDK iOS悬浮球的实现方法

本文将为大家实现在iOS中悬浮球功能，希望大家阅读完这篇文章后对相关知识有一定的了解。

首先我们创建一个View，在View内新建一个Button作为悬浮按钮，当然你也可以直接继承自UIButton。

这里添加了屏幕旋转监听，以便于做横竖屏适配，kWidthScan_HWan为竖屏时屏宽比、kWidthScan_HWan为横屏时屏宽比。

/// 控件初始化
- (void)initUI {
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChange:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
    
    self.frame = CGRectMake(-22*kWidthScan_HWan, screenHeight_HWan/2, 44*kWidthScan_HWan, 44*kWidthScan_HWan);
    self.floatButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.floatButton setBackgroundImage:[UIImage imageNamed:@"HWan94SDK.bundle/floatViewImg"] forState:UIControlStateNormal];
    [self addSubview:self.floatButton];
    
    UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragAction:)];
    [self addGestureRecognizer:panGesture];
}

- (void)initFrame {
    [self.floatButton mas_makeConstraints:^(HWanMasConstraintMaker *make) {
        make.left.right.top.bottom.mas_equalTo(0);
    }];
}

悬浮球拖动主要代码如下，如果滑动悬浮球超过屏幕一半就停靠右侧，反之停靠左侧 ，这里竖屏情况下只允许停靠左右两侧，横屏下只允许停靠在充电口一侧，防止用户拖动屏幕会滑到通知栏或home键

/// 拖动悬浮球手势动作
- (void)dragAction:(UIPanGestureRecognizer *)gesture {
    UIGestureRecognizerState moveState = gesture.state;
    switch (moveState) {
        case UIGestureRecognizerStateBegan:
            break;
        case UIGestureRecognizerStateChanged:
        {
            CGPoint point = [gesture translationInView:[HWanBasicUniversal keyWindow]];
            self.center = CGPointMake(point.x + self.center.x, point.y + self.center.y);
        }
            break;
        case UIGestureRecognizerStateEnded:
        {
            CGPoint point = [gesture translationInView:[HWanBasicUniversal keyWindow]];
            CGPoint newPoint = CGPointMake(point.x + self.center.x, point.y + self.center.y);
            
            UIInterfaceOrientation interfaceOritation = [[UIApplication sharedApplication] statusBarOrientation];
            
            if (newPoint.x < screenWidth_HWan/2) {
                newPoint.x = self.bounds.size.width/2;
            }else {
                newPoint.x = screenWidth_HWan - self.bounds.size.width/2;
            }
            if (newPoint.y <= self.bounds.size.height/2 +44){
                newPoint.y = self.bounds.size.height/2 + 44;
            } else if (newPoint.y >= screenHeight_HWan - self.bounds.size.height) {
                newPoint.y = screenHeight_HWan - self.bounds.size.height/2 - 44;
            }
            
            /// 0.5秒侧边吸附动画
            [UIView animateWithDuration:0.5 animations:^{
                if (interfaceOritation == UIInterfaceOrientationPortrait) {
                    self.center = newPoint;
                } else if (interfaceOritation == UIInterfaceOrientationLandscapeRight) {
                    self.center = CGPointMake(screenWidth_HWan - 22*kHeightScan_HWan, newPoint.y);
                    
                } else if (interfaceOritation == UIInterfaceOrientationLandscapeLeft) {
                    self.center = CGPointMake(22*kHeightScan_HWan, newPoint.y);
                }
            }];
            
            /// 延迟2秒隐藏一半悬浮球
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                if (interfaceOritation == UIInterfaceOrientationPortrait) {
                    if (newPoint.x < screenWidth_HWan/2) {
                        self.center = CGPointMake(newPoint.x-22*kWidthScan_HWan, newPoint.y);
                    } else {
                        self.center = CGPointMake(newPoint.x+22*kWidthScan_HWan, newPoint.y);
                    }
                } else if (interfaceOritation == UIInterfaceOrientationLandscapeRight) {
                    self.center = CGPointMake(screenWidth_HWan, newPoint.y);
                } else if (interfaceOritation == UIInterfaceOrientationLandscapeLeft) {
                    self.center = CGPointMake(0, newPoint.y);
                }
            });
        }
            break;
        default:
            break;
    }
    
    [gesture setTranslation:CGPointZero inView:[HWanBasicUniversal keyWindow]];
}

切换横竖屏调整悬浮球位置

- (void)orientationChange:(NSNotification *)notification {
    UIInterfaceOrientation interfaceOritation = [[UIApplication sharedApplication] statusBarOrientation];
    [self changeInterface:interfaceOritation];
}

- (void)changeInterface:(UIInterfaceOrientation)oritation {
    if (oritation == UIInterfaceOrientationPortrait) {
        self.frame = CGRectMake(-22*kWidthScan_HWan, screenHeight_HWan/2, 44*kWidthScan_HWan, 44*kWidthScan_HWan);
    } else if (oritation == UIInterfaceOrientationLandscapeRight) {
        self.frame = CGRectMake(screenWidth_HWan - 22*kHeightScan_HWan, screenHeight_HWan/2, 44*kHeightScan_HWan, 44*kHeightScan_HWan);
    } else if (oritation == UIInterfaceOrientationLandscapeLeft) {
        self.frame = CGRectMake(-22*kHeightScan_HWan, screenHeight_HWan/2, 44*kHeightScan_HWan, 44*kHeightScan_HWan);
    }
}

以上就是iOS悬浮球的实现方法。如果有更好的实现方法也希望大家多多评论交流。