/**
* 记录当前最后一个弹幕View，通过这个View来计算是显示在哪个弹幕轨道上
*/
@property(nonatomic,retain) UIView *lastAnimateView;
/**
* 发送弹幕
*
* @param msgModel 弹幕数据Model
*/
-(void)barrageSendMsg:(BarrageModel *)msgModel;
@end
在.m文件中
#import "BarrageView.h"
#import "BarrageModel.h"
//屏幕的尺寸
#define SCREEN_FRAME [[UIScreen mainScreen] bounds]
//屏幕的高度
#define SCREEN_HEIGHT CGRectGetHeight(SCREEN_FRAME)
//屏幕的宽度
#define SCREEN_WIDTH CGRectGetWidth(SCREEN_FRAME)
@interface BarrageView()
{
CGFloat _minSpaceTime; /** 最小间距时间 */
}
/** 数据源 */
@property (nonatomic,retain)NSMutableArray *dataArr;
/** 弹幕UI的重用池 */
@property (nonatomic,retain)NSMutableArray *resuingArr;
@end
@implementation BarrageView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self setInterface];
}
return self;
}
-(void)setInterface
{
//初始化弹幕数据源，以及重用池
self.dataArr = [NSMutableArray array];
self.resuingArr = [NSMutableArray array];
//创建第一个弹幕加入重用池作为备用
UIView *view = [self createUI];
[self.resuingArr addObject:view];
//设置弹幕数据的初始轮询时间
_minSpaceTime = 1;
//检查是否可以取弹幕数据进行动画
[self checkStartAnimatiom];
}
-(void)checkStartAnimatiom
{
//当有数据信息的时候
if (self.dataArr.count>0) {
if (self.resuingArr.count>0) { //当重用池里面有备用的弹幕UI时
//在重用池中，取出第一个弹幕UI
UIView *view = [self.resuingArr firstObject];
[self.resuingArr removeObject:view];
//取出的这个弹幕UI开始动画
[self startAnimationWithView:view];
}else{ //当重用池没有备用的弹幕UI时
//重新创建一个弹幕UI
UIView *view = [self createUI];
//拿着这个弹幕UI开始动画
[self startAnimationWithView:view];
}
}
//延迟执行，在主线程中不能调用sleep()进行延迟执行
//调用自身方法，构成一个无限循环，不停的轮询检查是否有弹幕数据
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(_minSpaceTime * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self checkStartAnimatiom];
});
}
-(void)startAnimationWithView:(UIView *)view
{
//取出第一条数据
BarrageModel *barrageModel = [self.dataArr firstObject];
//计算昵称的长度
CGSize nameSize = [barrageModel.userName boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, 14) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{ } context:nil].size;
//计算消息的长度
CGSize msgSize = [barrageModel.userMsg boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, 14) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{ NSFontAttributeName:[UIFont systemFontOfSize:14]
} context:nil].size;
UIImageView *headImageView; //头像
UILabel *userNameLabel; //昵称
UILabel *userMsgLabel; //消息内容
//进行赋值，宽度适应
for (UIView *subView in view.subviews) {
if (subView.tag == 1000) {
headImageView = (UIImageView *)subView;
headImageView.image = [UIImage imageNamed:@""];
}else if (subView.tag == 1001){
userNameLabel = (UILabel *)subView;
userNameLabel.text = barrageModel.userName;
//重新设置名称Label宽度
CGRect nameRect = userNameLabel.frame;
nameRect.size.width = nameSize.width;
userNameLabel.frame = nameRect;
}else{
userMsgLabel = (UILabel *)subView;
userMsgLabel.text = barrageModel.userMsg;
//重新设置消息内容Label宽度
CGRect msgRect = userMsgLabel.frame;
msgRect.size.width = msgSize.width;
userMsgLabel.frame = msgRect;
}
}
//重新设置弹幕的总体宽度 = 头像宽度 + 头像左右两侧距离 + (如果名字宽度大于消息内容宽度，以名字宽度为基准，如果名字宽度小于消息内容宽度，以消息内容宽度为基准)
view.frame = CGRectMake(SCREEN_WIDTH, 0, CGRectGetWidth(headImageView.frame) + 4 + (CGRectGetWidth(userNameLabel.frame)>CGRectGetWidth(userMsgLabel.frame)?CGRectGetWidth(userNameLabel.frame):CGRectGetWidth(userMsgLabel.frame)), CGRectGetHeight(self.frame));
//不管弹幕长短，速度要求一致。 V(速度) 为固定值 = 100(可根据实际自己调整)
// S = 屏幕宽度+弹幕的宽度 V = 100(可根据实际自己调整)
// V(速度) = S(路程)/t(时间) -------> t(时间) = S(路程)/V(速度);
CGFloat duration = (view.frame.size.width+SCREEN_WIDTH)/100;
//最小间距运行时间为：弹幕从屏幕外完全移入屏幕内的时间 + 间距的时间
_minSpaceTime = (view.frame.size.width + 30)/100;
//最后做动画的view
_lastAnimateView = view;
//弹幕UI开始动画
[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
//运行至左侧屏幕外
CGRect frame = view.frame;
view.frame = CGRectMake(-frame.size.width, 0, frame.size.width, frame.size.height);
} completion:^(BOOL finished) {
//动画结束重新回到右侧初始位置
view.frame = CGRectMake(SCREEN_WIDTH, 0, 0, CGRectGetHeight(self.frame));
//重新加入重用池
[self.resuingArr addObject:view];
}];
//将这个弹幕数据移除
[self.dataArr removeObject:barrageModel];
}
#pragma mark public method
-(void)barrageSendMsg:(BarrageModel *)msgModel{
//添加弹幕数据
[self.dataArr addObject:msgModel];
}
#pragma mark 创建控件
-(UIView *)createUI
{
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(SCREEN_WIDTH, 0, 0, CGRectGetHeight(self.frame))];
view.backgroundColor = [UIColor colorWithWhite:0 alpha:0.3];
UIImageView *headImageView = [[UIImageView alloc] initWithFrame:CGRectMake(2, 2, CGRectGetHeight(self.frame)-4, CGRectGetHeight(self.frame)-4)];
headImageView.layer.cornerRadius = headImageView.frame.size.width/2;
headImageView.layer.masksToBounds = YES;
headImageView.tag = 1000;
headImageView.backgroundColor = [UIColor redColor];
[view addSubview:headImageView];
UILabel *userNameLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(headImageView.frame) + 2, 0, 0,14)];
userNameLabel.font = [UIFont systemFontOfSize:14];
userNameLabel.tag = 1001;
[view addSubview:userNameLabel];
UILabel *userMsgLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(headImageView.frame)+2, CGRectGetMaxY(userNameLabel.frame), 0, 14)];
userMsgLabel.font = [UIFont systemFontOfSize:14];
userMsgLabel.tag = 1002;
[view addSubview:userMsgLabel];
[self addSubview:view];
return view;
}
