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;}

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