iOS Pin It SDK with no documentation and sample code

I'm trying to go through the basic tutorial on Pinterest's website.

the link for downloading documentation and iOS sdk doesn't provide documentation or sample code.there was only bundles in it

here is my viewcontroller.m file

#import "ViewController.h"
#import <Pinterest/Pinterest.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    UIButton* pinItButton = [Pinterest pinItButton];
    [pinItButton addTarget:self
                    action:@selector(pinIt:)
          forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:pinItButton];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)pinIt:(id)sender
{
    Pinterest *pinterest = [[Pinterest alloc]initWithClientId:@"1431885" urlSchemeSuffix:@"pin1431885"];
    [pinterest createPinWithImageURL:@"http://www.warrenphotographic.co.uk/photography/bigs/10122-Silver-and-red-kittens-white-background.jpg" sourceURL:@"http://placekitten.com" description:@"Pinning from Pin It Demo"];
}

@end

my code is fairly straight forward, i just couldn't get it running on my dev iphone it kept throwing:

2013-06-06 17:17:27.787 Pinterest Testing[9403:907] -[__NSCFConstantString absoluteString]: unrecognized selector sent to instance 0x1c86c
2013-06-06 17:17:31.626 Pinterest Testing[9403:907] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFConstantString absoluteString]: unrecognized selector sent to instance 0x1c86c'
*** First throw call stack:
(0x32f4d3e7 0x3ac48963 0x32f50f31 0x32f4f64d 0x32ea7208 0x1a9f9 0x1a71d 0x34e47087 0x34e4703b 0x34e47015 0x34e468cb 0x34e46db9 0x34d6f5f9 0x34d5c8e1 0x34d5c1ef 0x36a745f7 0x36a74227 0x32f223e7 0x32f2238b 0x32f2120f 0x32e9423d 0x32e940c9 0x36a7333b 0x34db02b9 0x19f4d 0x3b075b20)
libc++abi.dylib: terminate called throwing an exception

Solution

You are sending your URLs as NSString objects. NSString doesn't have a -absoluteString method, this is what the crash log is telling you.

The declaration of the Pinterest method (in Pinterest.h) is as follows:

- (void)createPinWithImageURL:(NSURL *)imageURL
                    sourceURL:(NSURL *)sourceURL
                  description:(NSString *)descriptionText;

You need to send NSURL objects, not NSString's for the imageURL and sourceURL.

So for your case:

- (void)pinIt:(id)sender
{
    NSURL *imageURL     = [NSURL URLWithString:@"http://www.warrenphotographic.co.uk/photography/bigs/10122-Silver-and-red-kittens-white-background.jpg"];
    NSURL *sourceURL    = [NSURL URLWithString:@"http://placekitten.com"];

    Pinterest *pinterest = [[Pinterest alloc]initWithClientId:@"1431885" urlSchemeSuffix:@"pin1431885"];
    [pinterest createPinWithImageURL:imageURL
                           sourceURL:sourceURL
                         description:@"Pinning from Pin It Demo"];
}