Google Drive API Integration iOS...
First see the link below Once...Link:
https://developers.google.com/drive/v3/web/quickstart/ios
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
NSString *userAgent = @"Mozilla/5.0 (iPhone; CPU iPhone OS 10_3 like Mac OS X) AppleWebKit/603.1.23 (KHTML, like Gecko) Version/10.0 Mobile/14E5239e Safari/602";
// set default useragent
NSDictionary *dictionary = [[NSDictionary alloc]initWithObjectsAndKeys:userAgent,@"UserAgent", nil];
[[NSUserDefaults standardUserDefaults] registerDefaults:(dictionary)];
return YES;
}
#import <UIKit/UIKit.h>
#import "GTMOAuth2ViewControllerTouch.h"
#import "GTLRDrive.h"
@interface ViewController : UIViewController
@property (nonatomic, strong) GTLRDriveService *service;
@property (nonatomic, strong) UITableView *output;
@property (nonatomic, strong) NSString *checkLogout;
@end
#import "ViewController.h"
#import "FilesViewController.h"
static NSString *const kKeychainItemName = @"Drive API";
static NSString *const kClientID = @"ADD Client ID";
@implementation ViewController
@synthesize service = _service;
@synthesize output = _output;
// When the view loads, create necessary subviews, and initialize the Drive API service.
- (void)viewDidLoad {
[super viewDidLoad];
// Create a UITextView to display output.
self.output = [[UITableView alloc] initWithFrame:self.view.bounds];
self.output.backgroundColor = [UIColor greenColor];
self.output.contentInset = UIEdgeInsetsMake(20.0, 0.0, 20.0, 0.0);
self.output.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
// Initialize the Drive API service & load existing credentials from the keychain if available.
self.service = [[GTLRDriveService alloc] init];
self.service.authorizer = [GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName:kKeychainItemName
clientID:kClientID
clientSecret:nil];
}
// When the view appears, ensure that the Drive API service is authorized, and perform API calls.
- (void)viewDidAppear:(BOOL)animated {
if ((!self.service.authorizer.canAuthorize) || ([self.checkLogout isEqualToString:@"YES"])) {
// Not yet authorized, request authorization by pushing the login UI onto the UI stack.
[self presentViewController:[self createAuthController] animated:YES completion:nil];
self.checkLogout=@"";
} else {
[self listFiles];
}
}
// List up to 20 files in Drive
- (void)listFiles {
GTLRDriveQuery_FilesList *query = [GTLRDriveQuery_FilesList query];
query.fields = @"nextPageToken, files(id, name)";
query.pageSize = 20;
[self.service executeQuery:query
delegate:self
didFinishSelector:@selector(displayResultWithTicket:finishedWithObject:error:)];
}
// Process the response and display output
- (void)displayResultWithTicket:(GTLRServiceTicket *)ticket
finishedWithObject:(GTLRDrive_FileList *)result
error:(NSError *)error {
if (error == nil) {
NSMutableString *filesString = [[NSMutableString alloc] init];
NSMutableArray *arr=[NSMutableArray new];
if (result.files.count > 0) {
// [output appendString:@"Files:\n"];
for (GTLRDrive_File *file in result.files) {
[arr addObject:file];
[filesString appendFormat:@"%@ (%@)\n", file.name, file.identifier];
if(file==[result.files lastObject])
{
FilesViewController *fvc=[self.storyboard instantiateViewControllerWithIdentifier:@"FilesViewController"];
UINavigationController *nav =[[UINavigationController alloc]initWithRootViewController:fvc];
fvc.filesArr=arr;
fvc.service=self.service;
[self presentViewController:nav animated:YES completion:nil];
}
}
} else {
FilesViewController *fvc=[self.storyboard instantiateViewControllerWithIdentifier:@"FilesViewController"];
UINavigationController *nav =[[UINavigationController alloc]initWithRootViewController:fvc];
fvc.filesArr=arr;
[self presentViewController:nav animated:YES completion:nil];
}
} else {
NSMutableString *message = [[NSMutableString alloc] init];
[message appendFormat:@"Error getting presentation data: %@\n", error.localizedDescription];
[self showAlert:@"Error" message:message];
}
}
// Creates the auth controller for authorizing access to Drive API.
- (GTMOAuth2ViewControllerTouch *)createAuthController {
GTMOAuth2ViewControllerTouch *authController;
// If modifying these scopes, delete your previously saved credentials by
// resetting the iOS simulator or uninstall the app.
NSArray *scopes = [NSArray arrayWithObjects:kGTLRAuthScopeDriveReadonly, nil];
authController = [[GTMOAuth2ViewControllerTouch alloc]
initWithScope:[scopes componentsJoinedByString:@" "]
clientID:kClientID
clientSecret:nil
keychainItemName:kKeychainItemName
delegate:self
finishedSelector:@selector(viewController:finishedWithAuth:error:)];
return authController;
}
// Handle completion of the authorization process, and update the Drive API
// with the new credentials.
- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController
finishedWithAuth:(GTMOAuth2Authentication *)authResult
error:(NSError *)error {
if (error != nil) {
[self showAlert:@"Authentication Error" message:error.localizedDescription];
self.service.authorizer = nil;
}
else {
self.service.authorizer = authResult;
[self dismissViewControllerAnimated:YES completion:nil];
}
}
// Helper for showing an alert
- (void)showAlert:(NSString *)title message:(NSString *)message {
UIAlertController *alert =
[UIAlertController alertControllerWithTitle:title
message:message
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *ok =
[UIAlertAction actionWithTitle:@"OK"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction * action)
{
[alert dismissViewControllerAnimated:YES completion:nil];
}];
[alert addAction:ok];
[self presentViewController:alert animated:YES completion:nil];
}
@end
#import <UIKit/UIKit.h>
#import "GTMOAuth2ViewControllerTouch.h"
#import "GTLRDrive.h"
@interface FilesViewController : UIViewController
@property (nonatomic, strong) GTLRDriveService *service;
@property (nonatomic,strong)NSMutableArray *filesArr;
@end
#import "FilesViewController.h"
#import "ViewController.h"
@interface FilesViewController ()
@end
@implementation FilesViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[ self.navigationController.navigationBar setBarTintColor : [UIColor whiteColor]];
[self showbackButton];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)showbackButton
{
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"LogOut" style:UIBarButtonItemStylePlain target:self action:@selector(logoutButtonClicked:)];
}
-(void)logoutButtonClicked:(id)sender
{
ViewController *vc=[self.storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
vc.checkLogout=@"YES";
[self presentViewController:vc animated:YES completion:nil];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if(self.filesArr.count>0){
return [self.filesArr count];
}else {
return 1;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = @"Cell";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
if(self.filesArr.count>0){
GTLRDrive_File *file=[self.filesArr objectAtIndex:indexPath.row];
cell.textLabel.text=file.name;
} else {
cell.textLabel.text=@"No files found..";
}
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
GTLRDrive_File *file=[self.filesArr objectAtIndex:indexPath.row];
NSLog(@"....>> %@",file.identifier);
NSString *url = [NSString stringWithFormat:@"https://www.googleapis.com/drive/v3/files/%@/export?alt=media&mimeType=application/pdf", file.identifier];
GTMSessionFetcher *fetcher = [self.service.fetcherService fetcherWithURLString:url];
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
if (error == nil) {
NSString *dataStr = [data base64EncodedStringWithOptions:0];
NSString *path = [[self applicationDocumentsDirectory].path
stringByAppendingPathComponent:@"fileName.txt"];
NSLog(@"Datastr--->> %@", dataStr);
[dataStr writeToFile:path atomically:YES
encoding:NSUTF8StringEncoding error:nil];
NSError *error;
NSString *fileContents2 = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
if (error)
NSLog(@"Error reading file: %@", error.localizedDescription);
// maybe for debugging...
NSLog(@"contents: %@", fileContents2);
NSURL *url = [NSURL fileURLWithPath:path];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
UIWebView *webView=[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[webView setUserInteractionEnabled:YES];
// [webView setDelegate:self];
[webView loadRequest:requestObj];
[self.view addSubview:webView];
NSLog(@"Retrieved file content-------- %@",dataStr);
} else {
NSLog(@"An error occurred: %@", error);
}
}];
}
- (void)myFetcher:(GTMSessionFetcher *)fetcher receivedData:(NSData *)dataReceivedSoFar
{
NSLog(@"%@ ",dataReceivedSoFar);
}
- (NSURL *)applicationDocumentsDirectory {
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory
inDomains:NSUserDomainMask] lastObject];
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
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