iOS悬浮球效果

话不多说直接上代码，一共需要四个文件，产品要求全局只能有一个悬浮球，为了不受tabbar的影象，所以做成了单例，统一由单例去设置悬浮球的属性，可根据项目具体要求更改下列代码，代码如下：

ANTSuspensionBtn.h

#import <UIKit/UIKit.h>

@class ANTSuspensionBtn;

@protocol ANTSuspensionViewDelegate <NSObject>
/** 点击悬浮球的回调 */
- (void)suspensionViewClick:(ANTSuspensionBtn *)suspensionView;
@end

@interface ANTSuspensionBtn : UIButton

/** 代理 */
@property (nonatomic, weak) id<ANTSuspensionViewDelegate> delegate;

- (instancetype)initWithFrame:(CGRect)frame color:(UIColor*)color;

/**
 *  显示
 */
- (void)show;

@end

ANTSuspensionBtn.m

#import "ANTSuspensionBtn.h"
#define kTouchWidth self.frame.size.width
#define kTouchHeight self.frame.size.height
@implementation ANTSuspensionBtn
- (instancetype)initWithFrame:(CGRect)frame color:(UIColor *)color
{
    if(self = [super initWithFrame:frame])
    {
        self.userInteractionEnabled = YES;
        self.backgroundColor = color;
        self.alpha = 1.0;
        self.titleLabel.font = [UIFont systemFontOfSize:14];
        
        //拖动
        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(changeLocation:)];
        pan.delaysTouchesBegan = YES;
        [self addGestureRecognizer:pan];
        //点击
        [self addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
    }
    return self;
}

#pragma mark - event response
- (void)changeLocation:(UIPanGestureRecognizer*)p
{
    UIWindow *appWindow = [UIApplication sharedApplication].delegate.window;
    CGPoint panPoint = [p locationInView:appWindow];
    
    //透明度 
    if(p.state == UIGestureRecognizerStateBegan)
    {
        self.alpha = 1;
    }
    else if (p.state == UIGestureRecognizerStateEnded)
    {
        self.alpha = 0.5;
    }
    
    //位置
    if(p.state == UIGestureRecognizerStateChanged)
    {
        self.center = CGPointMake(panPoint.x, panPoint.y);
    }else if(p.state == UIGestureRecognizerStateEnded)
    {
        CGFloat left = fabs(panPoint.x);
        CGFloat right = fabs(kScreenWidth - left);
        //ripper:只停留在左右，需要在上下，将注释打开
        //        CGFloat top = fabs(panPoint.y);
        //        CGFloat bottom = fabs(kScreenHeight - top);
        
        CGFloat minSpace = MIN(left, right);
        //        CGFloat minSpace = MIN(MIN(MIN(top, left), bottom), right);
        CGPoint newCenter;
        CGFloat targetY = 0;
        
        //校正Y
        if (panPoint.y < 15 + kTouchHeight/2.0) {
            targetY = 15 + kTouchHeight/2.0;
        }else if (panPoint.y > (kScreenHeight - kTouchHeight/2.0 - 15)) {
            targetY = kScreenHeight - kTouchHeight/2.0 - 15;
        }else{
            targetY = panPoint.y;
        }
        
        if (minSpace == left) {
            newCenter = CGPointMake(kTouchHeight/3 + 20, targetY);
        }else if (minSpace == right) {
            newCenter = CGPointMake(kScreenWidth-kTouchHeight/3-20, targetY);
        }
        
        [UIView animateWithDuration:.25 animations:^{
            self.center = newCenter;
        }];
    }
}

- (void)click
{
    if([self.delegate respondsToSelector:@selector(suspensionViewClick:)])
    {
        [self.delegate suspensionViewClick:self];
    }
}
- (void)show
{
    [[UIApplication sharedApplication].keyWindow addSubview:self];

}
@end

ANTSuspensionManager.h

/*点击悬浮球的回调 */
- (void)suspensionManagerClick:(ANTSuspensionManager *)suspensionView;
@end
@interface ANTSuspensionManager : NSObject

@property (nonatomic , weak) id<ANTSuspensionManagerDelegate>delegate;

//初始化
+ (ANTSuspensionManager *)sharedSuspensionManager;

//添加悬浮球
- (void)createSuspension;

//显示悬浮球
- (void)displaySuspension;
//隐藏悬浮球
- (void)hiddenSuspension;
//改变悬浮球的透明度
- (void)changeSuspensionAlpha:(CGFloat)alpha;
@end

ANTSuspensionManager.m

#import "ANTSuspensionManager.h"
#import "ANTSuspensionBtn.h"
static ANTSuspensionManager *sharedSuspensionManager = nil;

@interface ANTSuspensionManager ()<ANTSuspensionViewDelegate>
/** 悬浮球*/
@property (nonatomic , strong) ANTSuspensionBtn *susGlobe;
@end
@implementation ANTSuspensionManager
+ (ANTSuspensionManager *)sharedSuspensionManager
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedSuspensionManager = [[self alloc] init];
    });
    return sharedSuspensionManager;
}
- (ANTSuspensionBtn *)susGlobe{
    if (!_susGlobe) {
        _susGlobe = [[ANTSuspensionBtn alloc] initWithFrame:CGRectMake(SCREENWidth - 60, SCREENHeight - 130, 50, 50) color:[UIColor clearColor]];
        [_susGlobe setImage:[UIImage imageNamed:@"实境"] forState:UIControlStateNormal];
        _susGlobe.delegate = self;
    }
    return _susGlobe;
}
- (void)createSuspension{

    [self.susGlobe show];

}
//显示悬浮球
- (void)displaySuspension;
{
    self.susGlobe.hidden = NO;
}
//隐藏悬浮球
- (void)hiddenSuspension;
{
    self.susGlobe.hidden = YES;

}
//改变悬浮球的透明度
- (void)changeSuspensionAlpha:(CGFloat)alpha;
{
    self.susGlobe.alpha = alpha;

}
#pragma mark - ANTSuspensionViewDelegate
- (void)suspensionViewClick:(ANTSuspensionBtn *)suspensionView
{
    if([self.delegate respondsToSelector:@selector(suspensionManagerClick:)])
    {
        [self.delegate suspensionManagerClick:self];
    }
}
@end