iOS分享詳解

一、分享類型

iOS支持的分享類型非常豐富，包括文本、圖片、鏈接、音頻、視頻、文件等。其中，常用的分享類型為文本、圖片、鏈接。

文本分享代碼如下：

UIActivityViewController *vc = [[UIActivityViewController alloc] initWithActivityItems:@[@"我是分享的文本"] applicationActivities:nil];
[self presentViewController:vc animated:YES completion:nil];

圖片分享代碼如下：

UIImage *image = [UIImage imageNamed:@"image.jpg"];
UIActivityViewController *vc = [[UIActivityViewController alloc] initWithActivityItems:@[image] applicationActivities:nil];
[self presentViewController:vc animated:YES completion:nil];

鏈接分享代碼如下：

NSURL *url = [NSURL URLWithString:@"http://www.example.com"];
UIActivityViewController *vc = [[UIActivityViewController alloc] initWithActivityItems:@[url] applicationActivities:nil];
[self presentViewController:vc animated:YES completion:nil];

二、分享平台

iOS支持的分享平台也非常多，包括微信、QQ、微博、短信、郵件等

分享到微信代碼如下：

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"weixin://"]]) {
    WXMediaMessage *message = [WXMediaMessage message];
    message.title = @"分享標題";
    message.description = @"分享描述";
    [message setThumbImage:[UIImage imageNamed:@"image.jpg"]];
    WXWebpageObject *webpage = [WXWebpageObject object];
    webpage.webpageUrl = @"http://www.example.com";
    message.mediaObject = webpage;

    SendMessageToWXReq *req = [[SendMessageToWXReq alloc] init];
    req.bText = NO;
    req.message = message;
    req.scene = WXSceneSession;

    [WXApi sendReq:req];
} else {
    // 未安裝微信客戶端
}

分享到QQ代碼如下：

if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"mqq://"]]) {
    QQApiNewsObject *newsObj = [QQApiNewsObject objectWithURL:[NSURL URLWithString:@"http://www.example.com"] title:@"分享標題" description:@"分享描述" previewImageData:UIImageJPEGRepresentation([UIImage imageNamed:@"image.jpg"], 0.5)];
    SendMessageToQQReq *req = [SendMessageToQQReq reqWithContent:newsObj];
    QQApiSendResultCode sent = [QQApiInterface sendReq:req];

    if (sent != EQQAPISENDSUCESS) {
        // 分享失敗
    }
} else {
    // 未安裝QQ客戶端
}

三、自定義分享界面

iOS提供了UIActivityViewController類來進行分享，但是該類的界面無法自定義，如果需要自定義分享界面，則需要自己編寫分享界面，可以參考以下代碼：

- (void)showCustomShareView {
    UIView *bgView = [[UIView alloc] initWithFrame:self.view.bounds];
    bgView.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];

    UIView *contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.frame), 200)];
    contentView.backgroundColor = [UIColor whiteColor];
    [bgView addSubview:contentView];

    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 20, CGRectGetWidth(contentView.frame), 20)];
    titleLabel.text = @"分享到";
    titleLabel.textColor = [UIColor blackColor];
    titleLabel.textAlignment = NSTextAlignmentCenter;
    [contentView addSubview:titleLabel];

    UIButton *shareButton1 = [[UIButton alloc] initWithFrame:CGRectMake(20, 60, 60, 60)];
    [shareButton1 setImage:[UIImage imageNamed:@"icon1.png"] forState:UIControlStateNormal];
    [shareButton1 addTarget:self action:@selector(shareButton1Clicked:) forControlEvents:UIControlEventTouchUpInside];
    [contentView addSubview:shareButton1];

    UIButton *shareButton2 = [[UIButton alloc] initWithFrame:CGRectMake(CGRectGetWidth(contentView.frame) / 2 - 30, 60, 60, 60)];
    [shareButton2 setImage:[UIImage imageNamed:@"icon2.png"] forState:UIControlStateNormal];
    [shareButton2 addTarget:self action:@selector(shareButton2Clicked:) forControlEvents:UIControlEventTouchUpInside];
    [contentView addSubview:shareButton2];

    UIButton *shareButton3 = [[UIButton alloc] initWithFrame:CGRectMake(CGRectGetWidth(contentView.frame) - 80, 60, 60, 60)];
    [shareButton3 setImage:[UIImage imageNamed:@"icon3.png"] forState:UIControlStateNormal];
    [shareButton3 addTarget:self action:@selector(shareButton3Clicked:) forControlEvents:UIControlEventTouchUpInside];
    [contentView addSubview:shareButton3];

    [self.view addSubview:bgView];
}

- (void)shareButton1Clicked:(UIButton *)sender {
    // 分享到第一個平台
}

- (void)shareButton2Clicked:(UIButton *)sender {
    // 分享到第二個平台
}

- (void)shareButton3Clicked:(UIButton *)sender {
    // 分享到第三個平台
}

四、注意事項

在進行分享時，需要注意以下事項：

1. 在分享前，需要檢查對應的平台是否安裝，如果沒有安裝，則需要提示用戶安裝對應的客戶端。

2. 在分享圖片和文件時，需要注意文件大小，過大的文件可能會導致分享失敗。

3. 在分享到微信和QQ時，需要進行額外的註冊和處理，具體可以參考官方文檔。