开源软件名称：

XGBarrage-implementation

开源软件地址：

https://gitee.com/xiao66guo/XGBarrage-implementation

开源软件介绍：

#XGBarrage-implementation

用完全绘制的方式实现弹幕及自定义表情和系统键盘间切换

项目功能介绍：

1️⃣用完全绘制的方式来实现弹幕的内容；

2️⃣实现自定义表情键盘和系统键盘之间的切换功能；

3️⃣实现通过放大器来查看选中表情的功能；

4️⃣用Switch开关来实现弹幕的显示与隐藏功能；

5️⃣通过是否输入弹幕的内容来监听“发送”按钮是否可用；

6️⃣对自定义表情键盘进行单独的抽取和封装，可以单独使用；

7️⃣对绘制弹幕的方法进行单独的抽取和疯转，可以单独使用；

8️⃣实现对计算文字的真实尺寸的方法进行封装；

9️⃣可实现全屏（或满屏）弹幕的功能；

绘制弹幕内容的部分代码：

+(XGImage *)xg_imageWithBarrage:(XGBarrageModel *)barrage{         CGFloat marginX = 5;    CGFloat expressionW = XGBarrageExpressionW;    CGFloat expressionH = expressionW;    CGFloat iconW = XGBarrageH;    CGFloat iconH = iconW;    CGSize userNameSize = [barrage.userName sizeWithFont:XGBarrageUserNameFont maxSize:CGSizeMake(MAXFLOAT, MAXFLOAT)];    CGSize contentSize = [barrage.content sizeWithFont:XGBarrageContentFont maxSize:CGSizeMake(MAXFLOAT, MAXFLOAT)];    CGFloat contentTextW = iconH + marginX * 4 + userNameSize.width + contentSize.width + barrage.expression.count * expressionH;    CGFloat contentTextH = XGBarrageH;    CGSize contentTextSize = CGSizeMake(contentTextW, contentTextH);    UIGraphicsBeginImageContextWithOptions(contentTextSize, NO, 0.0);    CGContextRef ctx = UIGraphicsGetCurrentContext();    CGContextSaveGState(ctx);        CGContextAddEllipseInRect(ctx, CGRectMake(0, 0, iconW, iconH));    UIImage *icon = [UIImage imageNamed:barrage.icon];    CGContextClip(ctx);    [icon drawInRect:CGRectMake(0, 0, iconW, iconH)];    CGContextRestoreGState(ctx);        CGFloat bgX = iconW + marginX;    CGFloat bgW = contentTextW - bgX;    CGRect bgF = CGRectMake(bgX, 0, bgW, contentTextH);    barrage.type ? [[UIColor clearColor] set] : [[UIColor clearColor] set];    [[UIBezierPath bezierPathWithRoundedRect:bgF cornerRadius:XGBarrageH * 0.5] fill];        CGFloat userNameX = bgX + marginX;    CGFloat userNameY = (contentTextH - userNameSize.height) * 0.5;    [barrage.userName drawAtPoint:CGPointMake(userNameX, userNameY) withAttributes:@{NSFontAttributeName:XGBarrageUserNameFont,NSForegroundColorAttributeName:barrage.type ? [UIColor magentaColor] : [UIColor redColor]}];        CGFloat contentX = userNameX + userNameSize.width + marginX;    [barrage.content drawAtPoint:CGPointMake(contentX, userNameY) withAttributes:@{NSFontAttributeName:XGBarrageContentFont,NSForegroundColorAttributeName:barrage.type ? [UIColor whiteColor] : [UIColor whiteColor]}];        __block CGFloat expressionX = contentX + contentSize.width;    CGFloat expressionY = (contentTextH - expressionH) * 0.5;    [barrage.expression enumerateObjectsUsingBlock:^(NSString *expressionName, NSUInteger idx, BOOL * _Nonnull stop) {        UIImage *expression = [UIImage imageNamed:expressionName];        [expression drawInRect:CGRectMake(expressionX, expressionY, expressionW, expressionH)];        expressionX += expressionW;    }];        // 从当前位图上下文获得图片    UIImage *userIcon = UIGraphicsGetImageFromCurrentImageContext();    // 结束上下文    UIGraphicsEndImageContext();    ctx = nil;