In this new Podcast Season I will start things off by showing you how to run WordPress on your laptop. I will explain this on a Mac, but the process is very similar (if not identical) on a PC. All you need is an installer that gives you Apache, MySQL and PHP on your local … Read more
We can use something called Fast Enumeration for this, using a modified for loop: // build an array NSArray *myArray = [[NSArray alloc]initWithObjects:@”One”, @”Two”, @”Three”, @”Four”, nil]; // loop through every element (dynamic typing) for (id tempObject in myArray) { NSLog(@”Single element: %@”, tempObject); } You don’t have to use dynamic typing if you know […]
We can use the C function rand() for this: int i = rand()%10+1; NSLog(@”Random Number: %i”, i); This generates an integer between 1 and 10. Alternatively you can use the arc4random function: int i = arc4random() % 10; NSLog(@”Random Number: %i”, i); This will generate a random number between 0 and 9. One thing of […]
Imagine we had a file called myfile.txt which is a standard text file. On each line we have a new item we’d like to read so that our app can do something with it. Here’s how we do that: // get a reference to our file NSString *myPath = [[NSBundle mainBundle]pathForResource:@”myfile” ofType:@”txt”]; // read the […]
What you really want is a method such as (BOOL)networkIsAvailable, returning YES or NO. Apple made it several megabytes long and requires you to study several years before you get to YES or NO. I hate that! This is such a basic function on an always-connected device that I find it appalling not to have […]
Once you have a reference to the file in question you can call the removeItemAtPath method: // get reference with path and filename NSString *filePath = [[NSString alloc]initWithFormat:@”Documents/myFile.txt”]; NSString *deleteThis = [NSHomeDirectory()stringByAppendingPathComponent:filePath]; // now delete the file [[NSFileManager defaultManager]removeItemAtPath:deleteThis error:nil]; This does not work with wildcards in the file name (for example *.jpg).
You can see the full directory under ~Library/Application Support/iPhone Simulator You’ll be presented with a list of iOS Versions, each of which has several folders to explore. To access data that your apps have written, head over to Applications and see a list of cryptic folders, each one corresponding to one of your apps. In […]
Imagine we had a file that we’ve saved: NSString *myFile = [NSHomeDirectory() stringByAppendingPathComponent:@”Documents/myFile.txt”]; Before accessing it we can determine if it exists or not: BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:[NSHomeDirectory()stringByAppendingPathComponent:myFile]];