UIActivityViewController的相关用法（三）--自定义分享方式（比第三方分享库轻便）

使用UIActivityViewController自定义分享的方式,

以下代码创建一个UIActivityViewController，可以用AirDrop、邮件、QQ、微信分享，AirDrop分享是数据传输，其他三项是文本分享，可以在实现了UIActivityItemSource协议的item类中控制，

// 创建UIActivityViewController，并呈现
-(void)createAndShowActivityViewController
{
    // 构造自定义Activities,只选择系统的 mail 和 airDrop 类型
    NSArray *activities = @[[QQActivity new],
                            [WeChatActivity new]];
    NSArray *excludedActivityTypes = @[UIActivityTypePostToFacebook,
                                    UIActivityTypePostToTwitter,
                                    UIActivityTypePostToWeibo,
                                    UIActivityTypeMessage,
                                    //UIActivityTypeMail,
                                    UIActivityTypePrint,
                                    UIActivityTypeCopyToPasteboard,
                                    UIActivityTypeAssignToContact,
                                    UIActivityTypeSaveToCameraRoll,
                                    UIActivityTypeAddToReadingList,
                                    UIActivityTypePostToFlickr,
                                    UIActivityTypePostToVimeo,
                                    UIActivityTypePostToTencentWeibo];

    // 构造待发送的数据项
    SharedItem *item = [[SharedItem alloc] initWithData:self.data andLink:@"http://www.baidu.com?pid=12j12kjdlsaj&d=jsdlkjfch9802"];

    //构建UIActivityViewController
    UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[item] applicationActivities:activities];
    activityViewController.excludedActivityTypes = excludedActivityTypes;

    activityViewController.completionHandler = ^(NSString *activityType, BOOL completed){
        // UIActivityViewController 退出时调用此Block
        // 无论是否成功，直接退出
        [self.delegate backToMainView];
    };
    [self presentViewController:activityViewController animated:YES completion:nil];
}

只贴出微信的Activity类

#import <UIKit/UIKit.h>

@interface WeChatActivity : UIActivity

@end

#import "WeChatActivity.h"

@implementation WeChatActivity

-(NSString*)activityType
{
    //相当于 UIActivityTypeAirDrop, 可以用来判断是什么Activity类型
    return @"com.hsun.ShareViaWeChat";
}

-(NSString*)activityTitle
{
    // 显示的Title
    return @"微信";
}
-(UIImage*)activityImage
{
    // 显示的图标，ios8及以后是彩色，大小可以查看此方法的文档
    return [UIImage imageNamed:@"weixin"];
}

-(void)prepareWithActivityItems:(NSArray *)activityItems
{
    //在此做操作，items就是要传输的数据，可以在此直接调用微信的api
    NSLog(@"%@",activityItems);
}

+(UIActivityCategory)activityCategory
{
    // 决定在UIActivityViewController中显示的位置，最上面是AirDrop，中间是Share，下面是Action
    return UIActivityCategoryShare;
}

-(void)performActivity
{
    // 没有自定义的UIViewController才会调用此方法。在这里可以做一些操作，需要在最后消除掉UIActivityviewController
    [self activityDidFinish:YES];
}

-(BOOL)canPerformWithActivityItems:(NSArray *)activityItems
{
    // 可以根据item的不同类型决定是否可以让行为服务操作
    return YES;
}

@end

对应的Item类（在此可以控制不同的Activity做不同的数据传输）

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface SharedItem : NSObject<UIActivityItemSource>

-(instancetype)initWithData:(NSData*)data andLink:(NSString*)link;

@end

#import "SharedItem.h"

@interface SharedItem ()
@property (nonatomic, strong) NSData *data;
@property (nonatomic, strong) NSString *link;
@end

@implementation SharedItem

-(instancetype)initWithData:(NSData *)data andLink:(NSString *)link
{
    self = [super init];
    if (self) {
        _data = data;
        _link = link;
    }
    return self;
}

-(instancetype)init
{
    @throw [NSException exceptionWithName:@"Do not use" reason:@"Please use initWithData:andLink to initiate." userInfo:nil];
    return nil;
}

#pragma mark - UIActivityItemSource
-(id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController
{
    return [NSData data];
}

-(id)activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(NSString *)activityType
{
    // 如果是通过 AirDrop，直接返回NSData
    if ([activityType isEqualToString:UIActivityTypeAirDrop]) {
        return self.data;
    }
    // 其他都是返回链接
    return self.link;
}

-(NSString*)activityViewController:(UIActivityViewController *)activityViewController subjectForActivityType:(NSString *)activityType
{
    return @"分享数据";
}

-(NSString*)activityViewController:(UIActivityViewController *)activityViewController dataTypeIdentifierForActivityType:(NSString *)activityType
{
    // 如果是通过 AirDrop，直接返回NSData
    if ([activityType isEqualToString:UIActivityTypeAirDrop]) {
         return @"com.hsun.customUTI.hsundata";
    }
    // 其他都是返回链接
    return nil;
}