新建子类，通过继承RCTViewManager的方式，导出一个按钮或者自己自定义的view，点击这个view的时候触发分享方法
如下：
- (UIView *)view
{
UIButton* button = [UIButton new];
[button addTarget:self action:@selector(testMethod) forControlEvents:UIControlEventTouchUpInside];
return button;
// return activityViewController.view;
}
- (void)testMethod {
NSLog(@"成功点击");
if ([UIApplication sharedApplication].keyWindow.rootViewController != nil) {
NSLog(@"有root vc");
NSMutableArray *items = [[NSMutableArray alloc] init];
[items addObject:@"分享的title"];
//图片必须存在
[items addObject:[UIImage imageNamed:@"already_shoucang"]];
[items addObject:@"https://www.baidu.com"];
UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil];
[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:activityViewController animated:true completion:^{
}];
activityViewController.completionWithItemsHandler = ^(UIActivityType __nullable activityType, BOOL completed, NSArray * __nullable returnedItems, NSError * __nullable activityError){
NSLog(@"%@ ---- %@", activityType, returnedItems);
};
} else {
NSLog(@"么有 root vc");
}
}
