本文实例为大家分享了iOS实现全局悬浮按钮的具体代码，供大家参考，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
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@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) UIButton *button;@end |
AppDelegate.m
先button懒加载
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- (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
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-(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
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- (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
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-(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; }]; } |
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服务器之家。
原文链接：https://blog.csdn.net/qiangshuting/article/details/87904469
