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
@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;
}];
}
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