全局手势按钮(随意拖动,点击事件)

连接: http://code.cocoachina.com/view/134248

创建一个对象继承UIWindow;

.m

#import <UIKit/UIKit.h>
typedef void(^MCWindowTapBlock)();

@interface MCAssistiveTouch : UIWindow
/// 单例
+ (instancetype)sharedInstance;
/// 展示
-(void)show;
/// 隐藏
-(void)dismiss;
/// 按钮点击的回调
@property(nonatomic,copy)MCWindowTapBlock windowTapBlock;

@end

.h

#import "MCAssistiveTouch.h"

@interface MCAssistiveTouch ()
{
    UIButton *_button;
}
@end

@implementation MCAssistiveTouch

static  MCAssistiveTouch *sharedInstance = nil ;

+ (instancetype)sharedInstance
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[self alloc] initWithFrame:CGRectMake(0, 0, 45, 45)];
        
    });
    return sharedInstance;
}


-(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];
        self.hidden = YES;
        
        _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;
}

-(void)show{

    self.hidden = NO;
}
-(void)dismiss{
    self.hidden = YES;
    
}
//按钮事件
-(void)choose
{
    if (self.windowTapBlock) {
        self.windowTapBlock();
    }
}
//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

使用:
显示:
[[MCAssistiveTouch sharedInstance] show];

隐藏:
[[MCAssistiveTouch sharedInstance] dismiss];

添加点击事件:
[MCAssistiveTouch sharedInstance].windowTapBlock = ^(){
        NSLog(@"点击了手势按钮哦");
    };