iOS如何实现全局悬浮按钮

这篇文章给大家分享的是有关iOS如何实现全局悬浮按钮的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。

具体内容如下

现在有很多app都做这个全局按钮

如上面两张图的效果，完成一个全局悬浮的按钮，而且不会划出屏幕外
既然是全局，那写在AppDelegate中
UIWindow是一种特殊的UIView，它相当于一块画框，而UIView相当于里面的画布。通常在一个app中只会有一个UIWindow。

AppDelegate.h

@interface AppDelegate : UIResponder @property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UIButton *button;@end

AppDelegate.m

先button懒加载

- (UIButton*)button {    if (!_button) {        _button = [UIButton buttonWithType:UIButtonTypeCustom];        _button.frame = CGRectMake(258, 450, 60, 60);//初始在屏幕上的位置        [_button setImage:[UIImage imageNamed:@"bcl_btn_whole"] forState:UIControlStateNormal];    }    return _button;}

然后将其加在window上，设置手势

-(void)createButton{    if (!_button) {        _window = [[UIApplication sharedApplication] keyWindow];        _window.backgroundColor = [UIColor whiteColor];        [_window addSubview:self.button];        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:                                       self action:@selector(locationChange:)];        pan.delaysTouchesBegan = YES;        [_button addGestureRecognizer:pan];    }}

这个呢是为了开机启动两秒后创建全局button

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    [self performSelector:@selector(createButton) withObject:nil afterDelay:2];}

最关键的就是设置button不要划出屏幕外
以下四个else if分别为屏幕的上下左右
设置一个标记值isOVer
如果超出屏幕范围，纠正回来

-(void)locationChange:(UIPanGestureRecognizer*)p{    CGFloat HEIGHT=_button.frame.size.height;    CGFloat WIDTH=_button.frame.size.width;    BOOL isOver = NO;    CGPoint panPoint = [p locationInView:[UIApplication sharedApplication].windows[0]];    CGRect frame = CGRectMake(panPoint.x, panPoint.y, HEIGHT, WIDTH);    NSLog(@"%f--panPoint.x-%f-panPoint.y-", panPoint.x, panPoint.y);    if(p.state == UIGestureRecognizerStateChanged){        _button.center = CGPointMake(panPoint.x, panPoint.y);    }    else if(p.state == UIGestureRecognizerStateEnded){        if (panPoint.x + WIDTH > KScreenWidth) {            frame.origin.x = KScreenWidth - WIDTH;            isOver = YES;        } else if (panPoint.y + HEIGHT > KScreenHeight) {            frame.origin.y = KScreenHeight - HEIGHT;            isOver = YES;        } else if(panPoint.x - WIDTH / 2< 0) {            frame.origin.x = 0;            isOver = YES;        } else if(panPoint.y - HEIGHT / 2 < 0) {            frame.origin.y = 0;            isOver = YES;        }        if (isOver) {            [UIView animateWithDuration:0.3 animations:^{                self.button.frame = frame;            }];        }

感谢各位的阅读！关于"iOS如何实现全局悬浮按钮"这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！