前言
项目中要在原有的视频基础上添加弹幕功能，主要包含开始、停止、暂停、恢复、发送弹幕、弹幕点击等小功能。找到之前一个封装的弹幕库，在原有的基础上做了些功能改动和添加，写在这里记录一下。
项目层级关系
屏幕快照 2019-11-25 下午4.09.19.png
DanmuSend
这块儿主要是负责发送弹幕功能
包含DanmuSendView和DanmuOperateView，LGJDanmuOperateView主要承载弹出输入框功能，DanmuSendView主要是监听键盘及输入内容。
Danmu
这块儿是主要的弹幕逻辑区域
LGJDanmuUtil 配置弹幕字体大小、颜色等个性化定制
LGJDanmuLabel 弹幕显示label
LGJDanmuView 弹幕显示view，主要承载弹幕的label和头像img
LGJDanmuBgView 弹幕显示的背景view
LGJDanmuManager 弹幕功能的管理类
使用
在需要用到弹幕的vc中引入头文件：
#import "LGJDanmuManager.h"
#import "LGJDanmuSendView.h"
这里呢，使用了本地文件临时充当服务器返回的对应时间点的弹幕文字。
NSString *path = [[NSBundle mainBundle] bundlePath];
path = [[path stringByAppendingPathComponent:@"LGJDanmuSource"] stringByAppendingPathExtension:@"plist"];
NSArray *tempInfos = [NSArray arrayWithContentsOfFile:path];
NSArray *infos = [tempInfos sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
CGFloat v1 = [[obj1 objectForKey:kDanmuTimeKey] floatValue];
CGFloat v2 = [[obj2 objectForKey:kDanmuTimeKey] floatValue];
NSComparisonResult result = v1 <= v2 ? NSOrderedAscending : NSOrderedDescending;
return result;
}];
初始化弹幕管理类：
self.danmuManager = [[LGJDanmuManager alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, _screenV.bounds.size.height) data:infos inView:_screenV durationTime:1];
self.countTime = -1;
[self.danmuManager initStart];
_screenV模拟的视频播放view。
弹幕点击事件方法：
- (void)addTapGesture {
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHandler:)];
tap.cancelsTouchesInView = NO;
[self.screenV addGestureRecognizer:tap];
}
- (void)tapHandler:(UITapGestureRecognizer *)gesture {
[self.danmuManager.danmuBgView dealTapGesture:gesture block:^(LGJDanmuView *danmuView){
NSLog(@"点击了：-- %@", danmuView.danmuLabel.text);
}];
}
在这个vc中还需要有横竖屏切换的监听方法以及对应的处理方法:
- (void)p_prepare {
[self.danmuSendV backAction];
[self p_destoryTimer];
BOOL bPlaying = self.bPlaying;
[self stop:nil];
self.bPlaying = bPlaying;
[self.danmuManager resetDanmuWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, _screenV.bounds.size.height)];
}
发送弹幕的代理方法：
#pragma mark - LGJDanmuSendViewDelegate
- (void)sendDanmu:(LGJDanmuSendView *)danmuSendV info:(NSString *)info {
NSDate *now = [NSDate new];
double t = ((double)now.timeIntervalSince1970);
t = ((int)t)%1000;
CGFloat nowTime = self.countTime + t*0.0001;
[self.danmuManager insertDanmu:@{kDanmuContentKey:info, kDanmuTimeKey:@(nowTime), kDanmuOptionalKey:@"df"}];
if (self.bPlaying)
[self resume:nil];
}
- (void)closeSendDanmu:(LGJDanmuSendView *)danmuSendV {
if (self.bPlaying)
[self resume:nil];
}
点击开始按钮，开始滚动弹幕
- (IBAction)start:(id)sender {
[self.danmuManager initStart];
self.bPlaying = YES;
if ([_timer isValid]) {
return;
}
if (_timer == nil) {
__weak typeof(self) weakSelf = self;
self.timer = [NSTimer eoc_scheduledTimerWithTimeInterval:1 block:^{
ViewController *strogSelf = weakSelf;
[strogSelf progressVideo];
} repeats:YES];
}
}
- (void)progressVideo {
self.countTime++;
[_danmuManager rollDanmu:_countTime];
}
LGJDanmuManager
这个类是弹幕的管理类，主要的方法及实现方法都在这里
首先初始化数据
- (instancetype)initWithFrame:(CGRect)frame data:(NSArray *)infos inView:(UIView *)view durationTime:(NSUInteger)time {
self = [super init];
if (self) {
// self.frame = frame;
CGRect tempFrame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, 100);
self.frame = tempFrame;
self.infos = [infos mutableCopy];
self.superView = view;
self.durationTime = time;
self.danmuQueue = dispatch_queue_create("com.danmu.queue", NULL);
[self p_initInfo];
}
return self;
}
#pragma mark - Private
- (void)p_initInfo {
_countChannel = self.frame.size.height/CHANNEL_HEIGHT;
self.arRollChannelInfo = [NSMutableArray arrayWithCapacity:_countChannel];
self.arFadeChannelInfo = [NSMutableArray arrayWithCapacity:2];
NSUInteger sectionLines = nearbyintf((CGFloat)_countChannel / 3);
NSUInteger firstLines = MAX(_countChannel - sectionLines*2, sectionLines);
//滚动航道布局
{
//上中下，假设10，上：0-3，中：4-6，下：7-9
_upPosition = (DanmuPositionStruct){0, firstLines};
_middlePosition = (DanmuPositionStruct){_upPosition.length, sectionLines};
_downPosition = (DanmuPositionStruct){_middlePosition.start + _middlePosition.length, _countChannel - _middlePosition.start - _middlePosition.length};
//上中下，假设10，上：0-9，中：4-9，下：7-9
_upPosition = (DanmuPositionStruct){0, _countChannel};
_middlePosition = (DanmuPositionStruct){firstLines, _upPosition.length - firstLines};
_downPosition = (DanmuPositionStruct){_middlePosition.start + sectionLines, _upPosition.length - firstLines - sectionLines};
}
//浮现航道布局，这里选择的是上面滚动航道布局，所以不一定是现在这样子
{
//第一层：上中下，假设10，上：0-9，中：4-9，下：7-9，
_upFadeOnePosition = _upPosition;
_middleFadeOnePosition = _middlePosition;
_downFadeOnePosition = _downPosition;
//由于上一层为10，第二层为9，上：0-8，中：4-8，下：7-8
_upFadeTwoPosition = (DanmuPositionStruct){_upFadeOnePosition.start, _upFadeOnePosition.length - 1};
_middleFadeTwoPosition = (DanmuPositionStruct){_middleFadeOnePosition.start, _middleFadeOnePosition.length - 1};
_downFadeTwoPosition = (DanmuPositionStruct){_downFadeOnePosition.start, _downFadeOnePosition.length - 1};
}
_danmuManagerState = DanmuManagerStateWait;
}
- (void)p_initData {
[self.arRollChannelInfo removeAllObjects];
for (int i = 0; i < _countChannel; i++) {
[self.arRollChannelInfo addObject:[NSNumber numberWithInt:i]];
}
[self.arFadeChannelInfo removeAllObjects];
NSMutableArray *ar1 = [NSMutableArray new];
for (int i = 0; i < _countChannel; i++) {
[ar1 addObject:[NSNumber numberWithInt:i]];
}
[self.arFadeChannelInfo addObject:ar1];
NSMutableArray *ar2 = [NSMutableArray new];
for (int i = 0; i < _countChannel - 1; i++) {
[ar2 addObject:[NSNumber numberWithInt:i]];
}
[self.arFadeChannelInfo addObject:ar2];
self.currentIndex = 0;
[self.danmuBgView removeFromSuperview];
self.danmuBgView = nil;
LGJDanmuBgView *danmuBgView = [[LGJDanmuBgView alloc] initWithFrame:_frame];
self.danmuBgView = danmuBgView;
self.danmuBgView.backgroundColor = [UIColor lightGrayColor];
[self.superView addSubview:self.danmuBgView];
_danmuManagerState = DanmuManagerStateWait;
}
开始滚动弹幕
- (void)p_danmu:(NSTimeInterval)startTime
遍历danmuInfos从danmuInfos（弹幕信息）中获取弹幕文字内容、创建danmuView，对新创建的danmuView选择出合适的航道，获取到合适的航道后开始动画。主要原理是这样，至于合适的航道怎么选择，可以参考代码。
//选择在不超出缓冲区的且缓冲区最长的航道
- (NSUInteger)p_allChannelWithPosition:(DanmuPositionStruct)danmuPosition new:(LGJDanmuView *)newDanmuL {
CGFloat width = CHANNEL_WIDTH_MAX;
NSUInteger index = NSNotFound;
for (int i = (int)danmuPosition.start; i < danmuPosition.start + danmuPosition.length; i++) {id obj = [self.arRollChannelInfo objectAtIndex:i];
if ([obj isKindOfClass:[LGJDanmuView class]]) {
CGFloat rightX = ((LGJDanmuView *)obj).currentRightX;
if (rightX <= CHANNEL_WIDTH_MAX) {
CGFloat xx = rightX;
if (xx < width) {
width = xx;
index = i;
}
}
}
}
return index;
}
//选择不会碰撞的航道
- (BOOL)p_last:(LGJDanmuView *)lastDanmuL new:(LGJDanmuView *)newDanmuL {
CGFloat durationTime = newDanmuL.startTime - lastDanmuL.startTime;
if (durationTime > newDanmuL.animationDuartion) {
return YES;
}
CGFloat timeS = lastDanmuL.frame.size.width/lastDanmuL.speed;
if (timeS >= durationTime) {
return NO;
}
CGFloat timeE = newDanmuL.currentRightX/newDanmuL.speed;
if (timeE <= durationTime) {
return NO;
}
return YES;
}
#获取合适的航道、danmuView、offsetXY
- (void)p_getRollBestChannel:(LGJDanmuView *)newDanmuL completion:(void(^)(NSUInteger idx, CGFloat offsetX))completion {
DanmuPositionStruct danmuPosition;
if (newDanmuL.isPositionMiddle) {
danmuPosition = _middlePosition;
}
else if (newDanmuL.isPositionBottom) {
danmuPosition = _downPosition;
}
else {
danmuPosition = _upPosition;
}
NSUInteger index = danmuPosition.start;
BOOL bFind = NO;
for (int i = (int)danmuPosition.start; i < danmuPosition.start + danmuPosition.length; i++) {
id obj = [self.arRollChannelInfo objectAtIndex:i];
index = i;
if ([obj isKindOfClass:[LGJDanmuView class]]) {
bFind = [self p_last:obj new:newDanmuL];
}else {
bFind = YES;
}
if (bFind)
break;
}
if (bFind) {
id obj = [self.arRollChannelInfo objectAtIndex:index];
[self.arRollChannelInfo replaceObjectAtIndex:index withObject:newDanmuL];
if ([obj isKindOfClass:[LGJDanmuView class]]) {
CGFloat x = ((LGJDanmuView *)obj).currentRightX;
completion(index, x < 0 ? 0 : x);
}else
completion(index, 0);
}else {
if (index < danmuPosition.start + danmuPosition.length - 1) {
index += 1;
[self.arRollChannelInfo replaceObjectAtIndex:index withObject:newDanmuL];
completion(index, 0);
}
else {
NSUInteger index = NSNotFound;
index = [self p_allChannelWithPosition:danmuPosition new:newDanmuL];
if (index != NSNotFound) {
LGJDanmuView *obj = [self.arRollChannelInfo objectAtIndex:index];
[self.arRollChannelInfo replaceObjectAtIndex:index withObject:newDanmuL];
CGFloat x = obj.currentRightX;
completion(index, x < CHANNEL_SPACE ? CHANNEL_SPACE : x);
}else
completion(NSNotFound, 0);
}
}
}
停止
- (void)stop {
dispatch_sync(self.danmuQueue, ^{
_danmuManagerState = DanmuManagerStateStop;
[self.arRollChannelInfo removeAllObjects];
[self.arFadeChannelInfo removeAllObjects];
dispatch_async(dispatch_get_main_queue(), ^{
[self.danmuBgView.subviews makeObjectsPerformSelector:@selector(removeDanmu)];
[self.danmuBgView removeFromSuperview];
});
});
}
暂停
- (void)pause {
if (_danmuManagerState != DanmuManagerStateAnimationing)
return;
dispatch_sync(self.danmuQueue, ^{
_danmuManagerState = DanmuManagerStatePause;
[self.danmuBgView.subviews makeObjectsPerformSelector:@selector(pause)];
});
}
恢复
- (void)resume:(NSTimeInterval)nowTime {
if (_danmuManagerState != DanmuManagerStatePause)
return;
dispatch_sync(self.danmuQueue, ^{
_danmuManagerState = DanmuManagerStateAnimationing;
for (id subview in self.danmuBgView.subviews) {
if ([subview isKindOfClass:[LGJDanmuView class]]) {
[(LGJDanmuView *)subview resume:nowTime];
}
}
});
}
插入新弹幕
- (void)insertDanmu:(NSDictionary *)info {
dispatch_sync(self.danmuQueue, ^{
id optional = [LGJDanmuUtil defaultOptions];
__block LGJDanmuView *danmuView = [LGJDanmuView createWithInfo:info optional:optional inView:self.danmuBgView hasHeaderIcon:YES];
if ([danmuView isMoveModeFadeOut]) {
[self p_getFadeBestChannel:danmuView completion:^(NSUInteger idx, CGFloat offsetY) {
if (idx != NSNotFound) {
[danmuView setDanmuChannel:idx offset:offsetY];
}
}];
}
else {
[self p_getRollBestChannel:danmuView completion:^(NSUInteger idx, CGFloat offsetX) {
if (idx != NSNotFound) {
[danmuView setDanmuChannel:idx offset:offsetX];
}
}];
}
});
}
主要的功能点就是这些，但是具体的细节还是在代码里面，但是实现方式也不局限与代码中的这一种，每个人有每个人的思路，要是觉得有些地方比较晦涩也可以使用别的方式代替。这个基本上可以满足平常视频弹幕的基本功能需求了。
代码链接：
