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GIGA/Common/LXDanMuManager/LXDanMuManager.h

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+//
+//  LXDanMuManager.h
+//  LXAnimationTest
+//
+//  Created by lianxiang on 2018/8/14.
+//  Copyright © 2018年 com.giga.ios. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+@interface LXDanMuManager : NSObject
+@property (nonatomic,strong) NSArray *trackSpeedArray;
+@property (nonatomic,assign) float centerY;//所有轨道中心点
+@property (nonatomic,assign) float trackWidth;
+@property (nonatomic,strong) NSTimer *timer;
+@property (nonatomic,strong) UIView *superView;
+@property (nonatomic,strong) NSMutableArray *trackArray;
+@property (nonatomic,strong) UIView *baseView;
+
++(LXDanMuManager *)shareInstance;
+-(void)createDanmuWithTrackSpeedArray:(NSArray *)trackSpeedArray centerY:(float)centerY trackWidth:(float)trackWidth showInView:(UIView *)inView;
+/**
+ 插入一条弹幕，可以插入任意继承UIView的对象
+ 
+ @param customView 自定义的view（注意，最高不能超过轨道的高，否则会出问题）
+ @param trackIndex 插入弹幕的轨道（为-1则代表自动寻找最不拥挤的轨道插入）
+ */
+-(void)appendDanMuWithCustomView:(UIView *)customView toTrackIndex:(NSInteger)trackIndex;
+-(void)start;
+-(void)pause;
+-(void)stop;
+-(void)destory;
+
+@end

GIGA/Common/LXDanMuManager/LXDanMuManager.m

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+//
+//  LXDanMuManager.m
+//  LXAnimationTest
+//
+//  Created by lianxiang on 2018/8/14.
+//  Copyright © 2018年 com.giga.ios. All rights reserved.
+//
+
+#import "LXDanMuManager.h"
+#import "LXDanMuTrackView.h"
+
+@implementation LXDanMuManager
+
++ (LXDanMuManager *)shareInstance{
+    static LXDanMuManager *managerInstance = nil;
+    static dispatch_once_t once;
+    dispatch_once(&once, ^{
+        managerInstance = [[self alloc] init];
+    });
+    return  managerInstance;
+}
+
+- (void)createDanmuWithTrackSpeedArray:(NSArray *)trackSpeedArray centerY:(float)centerY trackWidth:(float)trackWidth showInView:(UIView *)inView{
+    _superView = inView;
+    _trackSpeedArray = trackSpeedArray;
+    _centerY = centerY;
+    _trackWidth = trackWidth;
+    _trackArray = [[NSMutableArray alloc] init];
+    [self initUI];
+}
+
+-(void)initUI{
+    _baseView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,_trackWidth, 0)];
+    _baseView.userInteractionEnabled = NO;
+    [_superView addSubview:_baseView];
+    
+    for (int i = 0; i<_trackSpeedArray.count; i++) {
+        
+        LXDanMuTrackView *trackView  = [[LXDanMuTrackView alloc] initWithFrame:CGRectMake(0, (TRACK_HEIGHT + TRACK_VERTICAL_PADDING) * i, _baseView.frame.size.width, TRACK_HEIGHT)];
+        [_baseView addSubview:trackView];
+        [_trackArray addObject:trackView];
+        if (_trackSpeedArray.count - 1 == i) {
+            _baseView.frame = CGRectMake(_baseView.frame.origin.x, _baseView.frame.origin.y, _baseView.frame.size.width,CGRectGetMaxY(trackView.frame));
+            _baseView.center = CGPointMake(_baseView.center.x, _centerY);
+        }
+    }
+}
+
+-(void)start{
+    
+    if (_timer) {
+        return;
+    }
+    _timer = [NSTimer timerWithTimeInterval:0.01 target:self selector:@selector(startAction) userInfo:nil repeats:YES];
+    [[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
+
+}
+
+- (void)pause{
+    [_timer invalidate];
+    _timer = nil;
+}
+
+- (void)stop{
+    
+    [_timer invalidate];
+    _timer = nil;
+    for (LXDanMuTrackView *trackView in _trackArray) {
+        [trackView cleanTrack];
+    }
+}
+
+- (void)destory{
+    
+    [_timer invalidate];
+    _timer = nil;
+    for (LXDanMuTrackView * trackView in _trackArray) {
+        [trackView cleanTrack];
+        [trackView removeFromSuperview];
+    }
+    [_trackArray removeAllObjects];
+    [_baseView removeFromSuperview];
+    _trackSpeedArray = nil;
+    _superView = nil;
+    _baseView = nil;
+    _trackArray = nil;
+    
+}
+
+-(void)startAction{
+    
+    for (int i = 0; i < _trackArray.count; i++) {
+        //执行轨道定时器方法
+        LXDanMuTrackView *trackView = _trackArray[i];
+        [trackView moveViewWithSpeed:[_trackSpeedArray[i] floatValue]];
+    
+    }
+}
+
+-(UIView *)baseView{
+    if (!_baseView) {
+        _baseView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,_trackWidth, 0)];
+        
+    }
+    return _baseView;
+}
+
+//自定义的view（注意，最高不能超过轨道的高，会出问题）
+- (void)appendDanMuWithCustomView:(UIView *)customView toTrackIndex:(NSInteger)trackIndex
+{
+    //trackIndex 插入弹幕的轨道（为-1则代表自动寻找最不拥挤的轨道插入）
+    NSInteger realTrackIndex = trackIndex;
+    if (realTrackIndex == -1) {
+        realTrackIndex = [self findTheMinTotalWidthTrack];
+    }
+    LXDanMuTrackView *trackView = _trackArray[realTrackIndex];
+    [trackView appendWithCustomView:customView];
+    
+}
+
+/**
+ 找到最短右侧出屏幕和等待数组总长度最短的轨道序号
+ 
+ @return 轨道的序号
+ */
+
+- (int)findTheMinTotalWidthTrack
+{
+    LXDanMuTrackView *firstTrackView = _trackArray[0];
+    int minWidthIndex = 0;
+    float minWidth = [firstTrackView rightOutScreenWidth];
+    for (int i = 0; i<_trackArray.count; i++)
+    {
+        LXDanMuTrackView *trackView = _trackArray[i];
+        float trackRightOutScreenWidth = [trackView rightOutScreenWidth];
+        if (trackRightOutScreenWidth < minWidth)
+        {
+            minWidth = trackRightOutScreenWidth;
+            minWidthIndex = i;
+        }
+    }
+    return minWidthIndex;
+}
+
+@end

GIGA/Common/LXDanMuManager/LXDanMuManagerConfig.h

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+//
+//  LXDanMuManagerConfig.h
+//  LXAnimationTest
+//
+//  Created by lianxiang on 2018/8/14.
+//  Copyright © 2018年 com.giga.ios. All rights reserved.
+//
+
+#ifndef LXDanMuManagerConfig_h
+#define LXDanMuManagerConfig_h
+
+//轨道中弹幕的最小间距
+#define TRACK_HORIZONTAL_PADDING 10
+//轨道与轨道的纵向间距
+#define TRACK_VERTICAL_PADDING 10
+//轨道的高度（轨道上的View不能超过此高度）
+#define TRACK_HEIGHT 60
+
+#endif /* LXDanMuManagerConfig_h */

GIGA/Common/LXDanMuManager/LXDanMuTrackView.h

@@ -0,0 +1,47 @@
+//
+//  LXDanMuTrackView.h
+//  LXAnimationTest
+//
+//  Created by lianxiang on 2018/8/14.
+//  Copyright © 2018年 com.giga.ios. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "LXDanMuManagerConfig.h"
+
+@interface LXDanMuTrackView : UIView
+
+/**
+ 等待出现到屏幕中的弹幕view数组
+ */
+@property (nonatomic,strong) NSMutableArray *waitShowArray;
+
+/**
+ 正在展示的弹幕view数组
+ */
+@property (nonatomic,strong) NSMutableArray *showingArray;
+/**
+ 向轨道中插入一条自定义的view
+ 
+ @param view 自定义的view，高度不可超过轨道的高，否则出问题
+ */
+- (void)appendWithCustomView:(UIView *)view;
+
+/**
+ 当前轨道右侧出屏幕的距离+等待出现到屏幕中的弹幕view的总长度和
+ @return 等待弹幕+右侧出屏幕弹幕的和
+ */
+- (float)rightOutScreenWidth;
+/**
+ 清理轨道，移除所有弹幕
+ */
+- (void)cleanTrack;
+/**
+ 根据速度移动轨道中所有弹幕的位置
+ 
+ @param speed 每0.01秒弹幕向左移动的距离
+ */
+- (void)moveViewWithSpeed:(float)speed;
+
+
+@end

GIGA/Common/LXDanMuManager/LXDanMuTrackView.m

@@ -0,0 +1,123 @@
+//
+//  LXDanMuTrackView.m
+//  LXAnimationTest
+//
+//  Created by lianxiang on 2018/8/14.
+//  Copyright © 2018年 com.giga.ios. All rights reserved.
+//
+
+#import "LXDanMuTrackView.h"
+
+@implementation LXDanMuTrackView
+
+- (instancetype)initWithFrame:(CGRect)frame{
+    
+    self = [super initWithFrame:frame];
+    if (self) {
+        [self dataConfig];
+    }
+    return self;
+}
+
+-(void)dataConfig{
+    
+    _showingArray = [[NSMutableArray alloc] init];
+    _waitShowArray = [[NSMutableArray alloc] init];
+    
+}
+
+- (void)appendWithCustomView:(UIView *)view{
+    
+    view.frame = CGRectMake(self.frame.size.width,view.frame.origin.y, view.frame.size.width,view.frame.size.height);
+    view.center = CGPointMake(view.center.x, TRACK_HEIGHT/2);
+    if (_showingArray.count) {
+        UIView *lastView = [_showingArray lastObject];
+        //最右侧的那条弹幕还没有完全出现在屏幕中
+        if (CGRectGetMaxX(lastView.frame) + TRACK_HORIZONTAL_PADDING > self.frame.size.width || _waitShowArray.count) {
+            //把这条弹幕加到等待数组中
+            [_waitShowArray addObject:view];
+        }else{
+            //加入轨道
+            [self addSubview:view];
+            //加入展示数组
+            [_showingArray addObject:view];
+            
+        }
+    }else{
+        
+        [self addSubview:view];
+        [_showingArray addObject:view];
+    }
+}
+
+- (void)moveViewWithSpeed:(float)speed{
+    //正在展示的弹幕自减一次
+    for (UIView *view in _showingArray) {
+        view.frame = CGRectMake(view.frame.origin.x - speed, view.frame.origin.y, view.frame.size.width, view.frame.size.height);
+        
+    }
+    //正在展示的弹幕
+    if (_showingArray.count){
+        UIView *firstView = [_showingArray firstObject];
+        UIView *lastView = [_showingArray lastObject];
+        
+        if (CGRectGetMaxX(firstView.frame) < 0) {
+            //已移除屏幕 remove
+            [firstView removeFromSuperview];
+            [_showingArray removeObjectAtIndex:0];
+            
+        }
+        if (_waitShowArray.count) {
+            //最右侧的view 已经完全出现
+            if (CGRectGetMaxX(lastView.frame) + TRACK_HORIZONTAL_PADDING  <= self.frame.size.width) {
+                //转移数组
+                [_showingArray addObject:[_waitShowArray firstObject]];
+                [_waitShowArray removeObjectAtIndex:0];
+                [self addSubview:[_showingArray lastObject]];
+                
+            }
+        }
+    }
+}
+- (float)rightOutScreenWidth
+{
+    float outScreenWidth = 0.0;
+    //如果等待数组中有值
+    if (_waitShowArray.count)
+    {
+        //先遍历所有等待数组中的view，累加长度和间距
+        for (UIView *view in _waitShowArray)
+        {
+            outScreenWidth += view.frame.size.width + TRACK_HORIZONTAL_PADDING;
+        }
+    }
+    
+    //如果展示数组中有值
+    if (_showingArray.count)
+    {
+        //拿出最右侧的view
+        UIView *lastView = [_showingArray lastObject];
+        //算出出屏宽
+        float rightOutWidth = CGRectGetMaxX(lastView.frame) - self.frame.size.width;
+        if (rightOutWidth < 0)
+        {
+            rightOutWidth = 0;
+        }
+        outScreenWidth += rightOutWidth;
+    }
+    
+    return outScreenWidth;
+}
+
+//清理轨道
+- (void)cleanTrack
+{
+    for (UIView *view in _showingArray)
+    {
+        [view removeFromSuperview];
+    }
+    [_showingArray removeAllObjects];
+    [_waitShowArray removeAllObjects];
+    
+}
+@end