我正在尝试对标准活动(Print,Mail,FaceBook等)实施自定义活动,但现在只需要标准打印(用于AirPrint)和我自己的直接方法自定义打印.我显然缺少一些基本的东西,因为我的自定义类中没有一个方法被调用.现在我只有一些NSLog语句来确定调用序列,并让框架运行.
// PrintActivity.h #import <UIKit/UIKit.h> @interface PrintActivity : UIActivity @end
还有他们
#import "PrintActivity.h"
@interface PrintActivity ()
@property (nonatomic,strong) UIWebView *dummyWebView;
@end
@implementation PrintActivity
- (NSString *)activityType {
NSLog(@"activityType");
return @"MetriScan Print";
}
- (NSString *)activityTitle {
NSLog(@"activityTitle");
return @"MetriScan\nPrint";
}
- (UIImage *)activityImage {
NSLog(@"activityImage");
UIImage *icon = [UIImage imageNamed:@"metriscan_57_c2a_3.png"];
return icon;
}
- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems {
NSLog(@"canPerformWithActivityItems");
return YES;
}
- (void)prepareWithActivityItems:(NSArray *)activityItems {
NSLog(@"prepareWithActivityItems");
}
- (void)performActivity {
NSLog(@"Do the actual printing here");
// My custom code here
}
这是主程序中的调用：
- (IBAction)printReport:(UIBarButtonItem *)sender {
NSLog(@"Print Report");
PrintActivity *metriscanPrint = [[PrintActivity alloc] init];
UIViewPrintFormatter *printFormatter = [self.webView viewPrintFormatter];
NSArray *activityItems = [NSArray arrayWithObjects:printFormatter,nil];
NSArray *appActivities = [NSArray arrayWithObjects:metriscanPrint,nil];
UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:appActivities];
//activityController.excludedActivityTypes = [NSArray arrayWithObjects:UIActivityTypePostToFacebook,UIActivityTypePostToTwitter,UIActivityTypePostToWeibo,UIActivityTypeMail,UIActivityTypeMessage,nil];
activityController.completionHandler = ^(NSString *activityType,BOOL completed) {
sender.enabled = YES;
};
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
[self presentViewController:activityController animated:YES completion:nil];
} else {
sender.enabled = NO;
self.printPop = [[UIPopoverController alloc] initWithContentViewController:activityController];
[self.printPop presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES];
}
正如我所说,自定义类中没有任何方法被调用,但系统的邮件,消息和复制图标显示在活动表中,而不是打印图标.我只期望系统打印图标(和我自己的).
如果我进一步取消注释顶部语句块(并注释掉NSArray * activityItems ………..),则系统会显示邮件,消息,打印和复制图标.在这个实验中,我认为我通过创建自己的格式化程序来混合不同的方法,但这似乎是WWDC 2012的建议？
如果我然后使用’excludeActivityTypes’取消注释该行,我只获得系统Print图标.
我欢迎任何意见,以帮助我搞清楚这一点.
如果有人知道任何示例代码来做我想要的,那将是非常棒的.
解决方法
在过去的这篇文章中,我正在把头发拉过UIActivity,苹果确实需要更好地解释它并添加更多功能;试试这个：
PrintActivity.h
#import <UIKit/UIKit.h> @interface PrintActivity : UIActivity @end
PrintActivity.m
#import "PrintActivity.h"
@implementation PrintActivity
- (NSString *)activityType
{
return @"MetriScan.Print";
}
- (NSString *)activityTitle
{
return @"Print MtriScan";
}
- (UIImage *)activityImage
{
//***** Note: I recommend using two sizes,as the iPad's UIActivity image size differs from
//***** the iPhone's. Also,create @2x sizes for Retina compatible devices. So you will
//***** have a total of 4 images.
if (UI_USER_INTERFACE_IdioM() == UIUserInterfaceIdiomPad)
{
return [UIImage imageNamed:@"test_72.png"];
}
return [UIImage imageNamed:@"test_57.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 your custom print code should go
}
@end
别忘了制作这两个文件：
PrintProvider.h
#import <UIKit/UIKit.h> @interface PrintProvider : UIActivityItemProvider <UIActivityItemSource> @end
PrintProvider.m
#import "PrintProvider.h"
@implementation PrintProvider
#pragma mark - UIActivityItemSource
- (id)activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(NSString *)activityType
{
NSLog(@"%s",__FUNCTION__);
NSLog(@"%@",activityType);
return [super activityViewController:activityViewController itemForActivityType:activityType];
}
@end
现在我们终于可以称之为：
- (IBAction)printReport:(UIBarButtonItem *)sender {
CustomProvider *customProvider =
[[CustomProvider alloc]init];
NSArray *items = [NSArray arrayWithObjects:customProvider,nil];
CustomActivity *ca = [[CustomActivity alloc]init];
UIActivityViewController *activityVC =
[[UIActivityViewController alloc] initWithActivityItems:items
applicationActivities:[NSArray arrayWithObject:ca]];
activityVC.excludedActivityTypes = @[UIActivityTypePostToWeibo,UIActivityTypeAssignToContact,UIActivityTypeCopyToPasteboard,UIActivityTypeSaveToCameraRoll,UIActivityTypePostToFacebook,UIActivityTypeMessage];
activityVC.completionHandler = ^(NSString *activityType,BOOL completed)
{
NSLog(@" activityType: %@",activityType);
NSLog(@" completed: %i",completed);
};
self.popoverController = [[UIPopoverController alloc] initWithContentViewController:activityVC];
CGRect rect = [[UIScreen mainScreen] bounds];
[self.popoverController
presentPopoverFromRect:rect inView:self.view
permittedArrowDirections:0
animated:YES];
}
