在iOS开发中,经常会遇到分享到微博微信时需要附带一张分享图片,图片中需要分享的相关信息(如产品二维码,分享人信息等)。
(1)首先要创建一个View
重写initWithFrame
方法将要分享的内容布局到上面
(2)新建方法 - (UIImage *)snapshotViewFromRect:(CGRect)rect withCapInsets:(UIEdgeInsets)capInsets
生成图片
- (UIImage *)snapshotViewFromRect:(CGRect)rect withCapInsets:(UIEdgeInsets)capInsets {
UIGraphicsBeginImageContextWithOptions(CGSizeMake(rect.size, NO, [UIScreen mainScreen].scale);
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(currentContext, - CGRectGetMinX(rect), - CGRectGetMinY(rect));
[self.layer renderInContext:currentContext];
UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *snapshotView = [[UIImageView alloc] initWithFrame:rect];
snapshotView.image = [snapshotImage resizableImageWithCapInsets:capInsets];
return snapshotView.image;
}
后期调整
设置水印大小,为了防止微博分享时生成的水印会挡住二维码,因此将分享的图片延长。
CGFloat heightWithShuiYin = 40.0;//设置图片延长的长度
更改图片的大小
UIGraphicsBeginImageContextWithOptions(CGSizeMake(rect.size.width, rect.size.height + heightWithShuiYin), NO, [UIScreen mainScreen].scale);
UIImageView * snapshotView = [[UIImageView alloc]initWithFrame:CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height + heightWithShuiYin)];
分享结果如图:
微博分享截图有关iOS的截图的拓展:
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