UIActivityViewController tips

UIActivityViewController.md

NSString *string = @"Text to share"
UIImage *image = [UIImage imageNamed:@"imageToShare"];
NSURL *URL = [NSURL URLWithString:@"relativeUrl"];

// Integrate with WeChat
NSArray *activity = @[[[WeixinSessionActivity alloc] init], [[WeixinTimelineActivity alloc] init]];

UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:@[string, image, URL] applicationActivities:activity];
[self.navigationController presentViewController:activityViewController animated:YES completion:nil];

注：微信需要在 application:didFinishLaunchingWithOptions: 中注册 app:

[WXApi registerApp:@"appId"];

这是从微信、微博等跳回来需要的设置，（注，微博的URL Schemes需在 appId 前面加 wb，微信的自带了 wx） ： TARGETS -> Info -> URL Types -> 编辑 URL Schemes：添加唯一的字符串

Custom UIActivity：

// .h
#import <UIKit/UIKit.h>
@interface ActivityViewCustomActivity : UIActivity
@end

// .m
#import "ActivityViewCustomActivity.h"
@implementation ActivityViewCustomActivity
- (NSString *)activityType
{
    return @"yourappname.Review.App";
}
- (NSString *)activityTitle
{
    return @"Review App";
}
- (UIImage *)activityImage
{  
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        return [UIImage imageNamed:@"iPadShare.png"];
    }
    else
    {
        return [UIImage imageNamed:@"iPhoneShare.png"];
    }
}
- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems
{
    NSLog(@"%s", __FUNCTION__);
    return YES;
}
- (void)prepareWithActivityItems:(NSArray *)activityItems
{
    NSLog(@"%s",__FUNCTION__);
}
- (UIViewController *)activityViewController
{
    NSLog(@"%s",__FUNCTION__);
    return nil;
}
- (void)performActivity
{   
    // This is where you can do anything you want, and is the whole reason for creating a custom 
    // UIActivity
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=yourappid"]];
    [self activityDidFinish:YES];
}
@end

Note On activityImage:

The alpha channel of the image is used as a mask to generate the final image that is presented to the user. Any color data in the image itself is ignored. Opaque pixels have a gradient applied to them and this gradient is then laid on top of a standard background. Thus, a completely opaque image would yield a gradient filled rectangle.

For iPhone and iPod touch, images on iOS 7 should be 60 by 60 points; on earlier versions of iOS, you should use images no larger than 43 by 43 points. For iPad, images on iOS 7 should be 76 by 76 points; on earlier versions of iOS you should use images no larger than 60 by 60 points. On a device with Retina display, the number of pixels is doubled in each direction.

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