Inside of uiwebview, what is a good way print a pdf document?
The pdf is accessible via a url or it can be loaded inside of an iframe.
Using the standard javascript widnow.print() functions will not work.
I am considering using a javascript bridge such as:
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *URL = [request URL];
if ([[URL scheme] isEqualToString:#"native"]) {
NSString *urlString = [[request URL] absoluteString];
NSArray *urlParts = [urlString componentsSeparatedByString:#":"];
NSString *cmd = [urlParts objectAtIndex:1];
if ( [cmd isEqualToString:#"printPdf"] ) {
// [self dosomething];
}
}
return YES;
}
At this point I need some sort of xcode function which accept a path to the pdf and send it the airPrinter.
Is this a good approach? I am searching examples of how to print a pdf inside a uiWebView.
As I've earned the tumbleweed badge for no up votes and no responses, I'll post my solution.
This fetches the pdf doc and opens the airPrint dialog--all within a uiWebView.
So if IOS would simply allow the javascript window.print() to function inside of uiWebView, my app would not be setting in the app store waiting for approval and re-release.
Anyway, here's a working solution:
- (void)printInit:(NSString *)parm {
UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
if(!controller){
NSLog(#"Couldn't get shared UIPrintInteractionController!");
return;
}
NSString *base = #"https://someurl.com/";
NSString *ustr = [base stringByAppendingString:parm];
//NSURL *url = [NSURL fileURLWithPath:ustr];
NSURL *url = [NSURL URLWithString:ustr];
NSData *thePdf = [NSData dataWithContentsOfURL:url];
controller.printingItem = thePdf;
UIPrintInfo *printInfo = [UIPrintInfo printInfo];
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = #"PDFDoc";
controller.printInfo = printInfo;
void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
if (!completed && error) {
NSLog(#"FAILED! error = %#",[error localizedDescription]);
}
};
CGRect rect = CGRectMake(310, 5, 100, 5);
[controller presentFromRect:rect inView:self.webView animated:YES completionHandler:completionHandler];
}
Related
First of all: Is it possible to download a custom font and display it in a UILabel?
I'm using this code to download a custom font from internet and display it in a UILabel but it does not work.
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize txt_UserName;
- (void)viewDidLoad {
[super viewDidLoad];
// 1
NSString *dataUrl = #"https://dl.dafont.com/dl/?f=stars_fighters";
NSURL *url = [NSURL URLWithString:dataUrl];
// 2
NSURLSessionDataTask *downloadTask = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
// 4: Handle response here
if (error == nil) {
NSLog(#"no error!");
if (data != nil) {
NSLog(#"There is data!");
[self loadFont:data];
}
} else {
NSLog(#"%#", error.localizedDescription);
}
}];
// 3
[downloadTask resume];
}
- (void)loadFont:(NSData *)data
{
NSData *inData = data;
CFErrorRef error;
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data);
CGFontRef font = CGFontCreateWithDataProvider(provider);
if(!CTFontManagerRegisterGraphicsFont(font, &error)){
CFStringRef errorDescription = CFErrorCopyDescription(error);
NSLog(#"Failed to load font: %#", errorDescription);
// CFRelease(errorDescription);
}
// CFRelease(font);
// CFRelease(provider);
CTFontRef ctFont = CTFontCreateWithGraphicsFont(font, 30, NULL, NULL);
UIFont *uiFont = CFBridgingRelease(ctFont);
dispatch_async(dispatch_get_main_queue(), ^{
[self.txt_UserName setFont:uiFont];
});
[self fontTest];
}
- (void)fontTest
{
NSArray *fontFamilies = [UIFont familyNames];
for (int i = 0; i < [fontFamilies count]; i++) {
NSString *fontFamily = [fontFamilies objectAtIndex:i];
NSArray *fontNames = [UIFont fontNamesForFamilyName:[fontFamilies objectAtIndex:i]];
NSLog (#"%#: %#", fontFamily, fontNames);
}
}
#end
Anyway I'm getting this error: Failed to load font: The operation couldn’t be completed. Invalid argument
At the place of the custom font I get a default iOS font.
Of course it's possible to download a custom font and display it in a UILabel,here is my code that works well:
step 1: Assuming the font file has been saved in the sandbox path Documents / StarsFighters.ttf, load the font and get font name（in YOUR_CLASS .m file）:
+ (NSString *)loadFontAndReturnFontName {
NSString *imgFilePath = [NSString stringWithFormat:#"%#/Documents/StarsFighters.ttf",NSHomeDirectory()];
NSURL *fontUrl = [NSURL fileURLWithPath:imgFilePath];
CGDataProviderRef fontDataProvider = CGDataProviderCreateWithURL((__bridge CFURLRef)fontUrl);
CGFontRef fontRef = CGFontCreateWithDataProvider(fontDataProvider);
CGDataProviderRelease(fontDataProvider);
CTFontManagerRegisterGraphicsFont(fontRef, NULL);
NSString *fontName = CFBridgingRelease(CGFontCopyPostScriptName(fontRef));
return fontName;
}
step2: use custom font
NSString *fontname = [YOUR_CLASS loadFontAndReturnFontName];
//fontname is #"StarsFighters",best set it to a global variable or save it
YOUR_LABEL.font = [UIFont fontWithName:fontname size:18.0];
I have the following code:
-(void) viewDidAppear:(BOOL)animated {
AsyncImageView *weatherImageView = [[AsyncImageView alloc] initWithFrame:weatherImage.frame];
NSString *myString = #"http://openweathermap.org/img/w/10d.png";
NSString *url = [NSString stringWithString:myString];
NSLog(#"The complete url is %#", url);
[weatherImageView loadImageFromURL:url];
[self.weatherImage addSubview:weatherImageView];
}
The image URL is all fine but the image does not show up when the view appears.
But if I write the following line in the same method
-(void) viewDidAppear: (BOOL) animated {
[self.weatherImage setImage:[UIImage imageNamed:[UIImage imageNamed:"background.png"]]];
}
I see that the image referred by "background.png" appears neat in the ImageView.
Wondering what is wrong with the first code.
loadImageFromURL expects a NSURL. Not a NSString:
AsyncImageView *weatherImageView = [[AsyncImageView alloc] initWithFrame:weatherImage.frame];
NSString *myString = #"http://openweathermap.org/img/w/10d.png";
NSURL *url = [NSURL URLWithString:myString];
NSLog(#"The complete url is %#", url);
[weatherImageView loadImageFromURL:url];
Wrangling with Air Print not doing anything from a button press, im trying to print a file from screen (my first time implementing this)
Ive added the UIPrintInteractionControllerDelegate in .h
.m Hooked up my button which has been checked as working correctly
Button handler code:
NSString *path = [[NSBundle mainBundle] pathForResource:#"mylocalhtmlfile" ofType:#"HTML"];
NSData *dataFromPath = [NSData dataWithContentsOfFile:path];
UIPrintInteractionController *printController = [UIPrintInteractionController sharedPrintController];
if(printController && [UIPrintInteractionController canPrintData:dataFromPath]) {
printController.delegate = self;
UIPrintInfo *printInfo = [UIPrintInfo printInfo];
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = [path lastPathComponent];
printInfo.duplex = UIPrintInfoDuplexLongEdge;
printController.printInfo = printInfo;
printController.showsPageRange = YES;
printController.printingItem = dataFromPath;
void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
if (!completed && error) {
NSLog(#"FAILED! due to error in domain %# with error code %u", error.domain, error.code);
}
};
[printController presentAnimated:YES completionHandler:completionHandler];
}
I get no action whatsoever, no presentation of the air print controls or anything unless file type is set to png
I'm trying to cache images I load from Flickr. If I load the same image, I'm hoping to use the cached version instead. For some reason, when I download an image from the internet, it works, but if I load it from my cache, it displays a blank image. I checked cacheData, and it has the same amount of bits as the image I put in, so it appears loading the file is working.
Here is how I cache images:
+ (void)cachePhoto:(NSData *)photo withKey:(NSString *)key {
if (photo) {
NSArray * urlArray = [fileManager URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask];
NSURL * targetDirectory = (NSURL *)[urlArray objectAtIndex:0];
targetDirectory = [targetDirectory URLByAppendingPathComponent:key];
[photo writeToURL:targetDirectory atomically:YES];
[cachedPhotos addObject:key];
NSLog(#"target url %#", targetDirectory);
}
}
+ (NSData *)photoInCache:(NSString *)key {
if ([cachedPhotos containsObject:key]) {
NSString * path = [[cacheDirectory URLByAppendingPathComponent:key] path];
NSLog(#"path: %#", path);
return [fileManager contentsAtPath:path];
} else {
return nil;
}
}
And my code to get it back:
NSData * cacheData = [PhotoCache photoInCache:key];
if (cacheData) {
self.imageView.image = [UIImage imageWithData:cacheData];
[spinner stopAnimating];
NSLog(#"used cached image");
} else {
dispatch_queue_t downloadQueue = dispatch_queue_create("get photo from flickr", NULL);
dispatch_async(downloadQueue, ^{
NSData * imageData = [[NSData alloc] initWithContentsOfURL:url];
dispatch_async(dispatch_get_main_queue(), ^{
[spinner stopAnimating];
self.imageView.image = [UIImage imageWithData:imageData];
[PhotoCache cachePhoto:imageData
withKey:key];
});
});
}
I figured it out - I was loading the image into the imageView in my prepareForSegue, where the ImageView was not yet loaded. I loaded the image in viewDidLoad and it worked. I also had to use UIImagePNGRepresentation, like suggested in the comments.
I think this is a really bad way to check user access to the resources.
Is there better way to get user access?
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
// create library
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
{
accessGiven = YES;
return ;
};
void (^assetGroupEnumberatorFailure)(NSError *) = ^(NSError *error) {
accessGiven = NO;
return;
};
// create 2 blocks
NSURL *url = [[NSURL alloc] initWithString:#" "];
[library assetForURL:url resultBlock:resultblock failureBlock:assetGroupEnumberatorFailure];
// use empty url to check acces..
[library release];
iOS 6.0 has better way to do that.
[ALAssetsLibrary authorizationStatus];
Method Description
Authorization Status Enum