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原文地址:http://blog.5ibc.net/p/86562.html

前提：当时看到别人写过这个类似AssistiveTouch的demo，但是有问题，第一改变不了位置、第二切换页面后无法使用、第三运行时偶尔会崩溃。然后自己就去度娘、论坛中都查了一些资料，然后结合起来写了这么一个demo。
思路：实现全局 需要在 AppDelegate.m 文件中 didFinishLaunchingWithOptions 方法里面实现
1、新建一个 继承于 UIWindow 的类 AssistiveTouch

//在 AssistiveTouch.h 文件中代码

#import <UIKit/UIKit.h>
@interface AssistiveTouch : UIWindow
{
    UIButton *_button;
}
-(id) initWithFrame:(CGRect)frame;
@end

//在 AssistiveTouch.m 文件中代码

#import "AssistiveTouch.h"
@interface AssistiveTouch ()
@end
@implementation AssistiveTouch
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/
-(id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor clearColor];
        self.windowLevel = UIWindowLevelAlert + 1;
//这句话很重要
        [self makeKeyAndVisible];
        _button = [UIButton buttonWithType:UIButtonTypeCustom];
        _button.backgroundColor = [UIColor grayColor];
        _button.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
        _button.layer.cornerRadius = frame.size.width/2;
        [_button addTarget:self action:@selector(choose) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:_button];
//放一个拖动手势，用来改变控件的位置
        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(changePostion:)];
        [_button addGestureRecognizer:pan];
    }
    return self;
}
//按钮事件
-(void)choose
{
    NSLog(@"悬浮窗");
}
//手势事件 －－ 改变位置
-(void)changePostion:(UIPanGestureRecognizer *)pan
{
    CGPoint point = [pan translationInView:self];
    CGFloat width = [UIScreen mainScreen].bounds.size.width;
    CGFloat height = [UIScreen mainScreen].bounds.size.height;
    CGRect originalFrame = self.frame;
    if (originalFrame.origin.x >= 0 && originalFrame.origin.x+originalFrame.size.width <= width) {
        originalFrame.origin.x += point.x;
    }
    if (originalFrame.origin.y >= 0 && originalFrame.origin.y+originalFrame.size.height <= height) {
        originalFrame.origin.y += point.y;
    }
    self.frame = originalFrame;
    [pan setTranslation:CGPointZero inView:self];
    if (pan.state == UIGestureRecognizerStateBegan) {
        _button.enabled = NO;
    }else if (pan.state == UIGestureRecognizerStateChanged){
    } else {
        CGRect frame = self.frame;
        //记录是否越界
        BOOL isOver = NO;
        if (frame.origin.x < 0) {
            frame.origin.x = 0;
            isOver = YES;
        } else if (frame.origin.x+frame.size.width > width) {
            frame.origin.x = width - frame.size.width;
            isOver = YES;
        }
        if (frame.origin.y < 0) {
            frame.origin.y = 0;
            isOver = YES;
        } else if (frame.origin.y+frame.size.height > height) {
            frame.origin.y = height - frame.size.height;
            isOver = YES;
        }
        if (isOver) {
            [UIView animateWithDuration:0.3 animations:^{
                self.frame = frame;
            }];
        }
        _button.enabled = YES;
    }  
}
@end

#import "AppDelegate.h"
#import "AssistiveTouch.h"
@interface AppDelegate ()
{
    //悬浮框
    AssistiveTouch * _Win;
}
@end
@implementation AppDelegate
// 设置自定义悬浮框坐标
-(void)setNew
{
    _Win = [[AssistiveTouch alloc] initWithFrame:CGRectMake(0, 0, 60, 60)];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    // 这句话很重要，要先将rootview加载完成之后在显示悬浮框，如没有这句话，将可能造成程序崩溃
    [self performSelector:@selector(setNew) withObject:nil afterDelay:3];
    [self.window makeKeyAndVisible];
    return YES;
}