We are familiar and well know all Swift changes between 2.0 and 2.1. And also difference between Xcode 6 and 7. But there are some changes between iOS 8 and 9.1 that we can’t ignore. Because... apps became malfunctioned.

CanOpenURL

Most significant and despicable difference is between iOS 9 and 9.1. The canOpenURL does not work as expected anymore. All checks for that are failing at this time.

if app.canOpenURL(url) {
   app.openURL(url)
}

To understand what happened, see this post: Quick Take on iOS 9 URL Scheme Changes.

But TL;DR is that you must explicitly set an array of URL schemes that your app may open. So add a key called LSApplicationQueriesSchemes to your Info.plist. And the value of this key is an array of URL schemes you want to be opened. Like: twitter, fb, instagram, vk.

More generally, xml for this in Info.plist should look like:

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>twitter</string>
    <string>instagram</string>
    <string>comgooglemaps</string>
    <string>yandexnavi</string>
</array>

3D Touch

Next big thing is how to fast implement quick actions for 3D-touching app icon.

As I have no 3D Touch devices (have just Force Touch one) and have no expertise in there, I just provide a link where it described very well: Add 3D Touch quick actions tutorial.

See also:

• Is your app iOS 9 ready? — Medium.
• iOS 9 not opening URL scheme — Stack Overflow
• Quick Take on iOS 9 URL Scheme Changes
• Add 3D Touch quick actions tutorial.

Let’s code!

Computer Science, Engineering, Law and Politics, Medicine, Philosophy and other great courses for free on iTunes U:

Don’t be shy to get it.

“[In Swift] Arithmetic operators (+, -, *, /, % and so forth) detect and disallow value overflow, ...”

Excerpt From: Apple Inc. “The Swift Programming Language.” iBooks. https://itun.es/us/jEUH0.l

typedef NS_ENUM(NSInteger, UIViewContentMode) {
    UIViewContentModeScaleToFill,
    UIViewContentModeScaleAspectFit,
    UIViewContentModeScaleAspectFill,
    ...
}

UIViewContentMode

typedef NS_ENUM(NSInteger, UITableViewCellStyle) {
    UITableViewCellStyleDefault,
    UITableViewCellStyleValue1,
    UITableViewCellStyleValue2,
    UITableViewCellStyleSubtitle
};

UITableViewCellStyle

This is very useful to make Sublime Text 3 switching tabs by cycle order (not by stack). Put this in your User keycap file (Preferences → Key Bindings — User):

  { «keys»: [«ctrl+tab»], «command»: «next_view» },
  { «keys»: [«ctrl+shift+tab»], «command»: «prev_view» }

Seeing the code listing is «typographically formatted»? Oh, it’s ok. Don’t copy-paste anything from web! Write your own code :-)

By the way, I found good Sublime Text’s settings tutorial for beginners.

***

Also, the best way to use todo-lists in Sublime Text is install the PlainTasks plugin. Look demo. It needs Package Control plugin to be installed on Sublime Text.

Essentials for this time!

How to round float values? Neither Stack Overflow topic has the full answer.

Generally, to round float-value and get int-value you can use lroundf (). Like this:

long int lroundf (float x);

Look Apple Developer Man for round () details.

By the way, for simple output rounded float, use token: @.0f

Also these functions are useful:

ceil (float x);
floor (float x);

NSNumber, float, double, etc. is also applicable.

Drunk owl.

It seems to be iOS 7 inherits abandoned original iPhone OS design.

Look at this awesome bottom dashboard we had in iPhone OS. iOS 7 will have the same. Brilliant!

Original iPhone OS and iOS 7.

Also, look at missing search icon on the left of pagination. Wow!

iOS 6.

Not like iOS 6!

It’s so curious, that this code:

if (![[event objectForKey:@’’state’’] isEqual:@’’ok’’] || ![[inbox objectForKey:@’’status’’] isEqual:@’’done’’]) {
// statement 1
}

will not run statement 1 like this way:

if ([[event objectForKey:@’’state’’] isEqual:@’’ok’’] || [[inbox objectForKey:@’’status’’] isEqual:@’’done’’]) {
// statement 2
} else {
// statement 1
}

Yes, I also know why :-)

... remember that the Ref suffix means that it is a pointer.