Jay Versluis

Jay is a medical miracle known as Super Survivor. He runs several YouTube channels and websites, and he's also live on Twitch sometimes. To support him on his mission to make the world a better place, you can support him on Patreon or buy him a coffee.

How to exchange data between View Controllers

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If you have two view controller classes you probably want to exchange data between them. Thanks to two methods we can do that, provided one view controller is presented via a modal segue. Here’s how it works step by step. Imagine you had two labels on each View Controller. We’ll call them myLabel1 and myLabel2 […]

How to add a second View Controller

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Here’s how you add a new View Controller to your project and switch to it via a segue: open a new Single View project add am Objective-C class and select subclass of UIViewController (we’ll call it MyViewController here) in MyViewController.h, import the other ViewController.h and vice versa, in ViewController.h, import MyVewController.h too head over to […]

I’m trying to read out the value of…

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I’m trying to read out the value of a UISlider and put it into a UIProgressView. Not a problem, all I need is to divide my UISlider.value by 100 to get the correct output. So far so good. However, for some reason this statement does not work. I don’t know why: self.progressValue.progress = [[self.mySlider.value]/100]; Doesn’t […]

How to fix “broken image captions” in WordPress 3.4

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We’ve been discussing an issue with broken captions at the WordPress forum over the last few days. It appears that due to a code change in the WordPress core, captions are now inserted in a different way. This is to allow for HTML in captions which was not possible beforehand.

Turns out that many themes have not been updated to make use of this. Sadly this means that many users are left hanging with themes that are no longer compatible with the latest version of WordPress.

Lets take a look at the problem and see if we can fix it.

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How to concatenate strings (i.e. print several at a time)

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This is really simple in PHP, however it’s not obvious in Objective-C because you’re not printing the strings directly. Rather you print two objects that point to each string. There is a method though which has the same effect: stringByAppendingString. Here’s how you use it: self.myLabel.text = [@”This is ” stringByAppendingString: @”my label”]; It gets […]

How to check the battery level of your iOS device?

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We can use the batteryLevel property of the UIDevice class for this. It will return a float: float myFloat = [[UIDevice currentDevice] batteryLevel]; If you’d like to print this in a UILabel you’ll have to convert it into a String Object like so: self.myLabel.text = [NSString stringWithFormat:@”%f”, myFloat]; For this to work battery monitoring needs […]

How to test the state of a UISegmentedControl

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We can use the selectedSegmentIndex property for this. Our segmented control thingy starts at 0 for the first value: if (segmentSwitch.selectedSegmentIndex == 0 ) { segmentLabel.text = @”You’ve selected YES”; } else { segmentLabel.text = @”You’ve selected NO”; } If you want to trigger an action when someone makes a selection you can query the […]

How to install EPEL and apachetop on Centos 5 and Centos 6

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I wanted to use apachetop to monitor one of my servers in real time. Much like top, apachetop reads the acces_log file in /var/logs/httpd/ and displays the results as apache processes happen.

Rather than installing apachetop from source, I thought a simple command like

yum install apachetop

should to the trick… but it doesn’t work by default. Now what?

Well an install via yum will only work if it is configured to look in the right repositories. Apachetop however is not part of the standard repos, hence we need to add what’s known as the EPEL package to yum (it stands for Extra Packages for Enterprise Linux).

In this article I’ll show you how to do it and how to run apachetop.

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