Suppress warnings

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
// ...
#pragma clang diagnostic pop

#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_6_0

        alignment = UITextAlignmentLeft;

#else

        alignment = NSTextAlignmentLeft;

#endif

Overriding abstract methods

[NSException raise:NSInternalInconsistencyException 
            format:@"You must override %@ in a subclass", NSStringFromSelector(_cmd)];

If your method returns a value, it's a bit easier to use

@throw [NSException exceptionWithName:NSInternalInconsistencyException
                               reason:[NSString stringWithFormat:@"You must override %@ in a subclass", NSStringFromSelector(_cmd)]
                             userInfo:nil];

Thanks to Barry Wark

Using dot notation with NSDictonary

NSDictionary+DotPath provides support for accessing and mutating nested dictionary values using dot notation. 

Given NSDictionary* dict:

dict = {
    int = 0;
    dictLevel1 =     {
        int = 1;
        dictLevel2 =         {
            int = 2;
        };
    };
}

Values can be accessed using a dot notation for the path e.g.

int i = [dict intForPath:@"dictLevel1.dictLevel2.int"]; // i = 2

Values can also be set using a dot notation for the path e.g.

[dict setInt:3 forPath:@"dictLevel1.dictLevel2.newInt"];

Which yields:

dict = {
    int = 0;
    dictLevel1 =     {
        int = 1;
        dictLevel2 =         {
            int = 2;
            newInt = 3;
        };
    };
}

If a nested dictionary doesn't exist or isn't mutable the dictionary is updated. In this example setting an array (myArray) to and undefined dictionary (dictLevel3) creates the dictionary:

NSArray* myArray = @[@"1", @"2"];
[dict setObject:myArray forPath:@"dictLevel1.dictLevel2.dictLevel3.a"];

Which yields:

dict = {
    int = 0;
    dictLevel1 =     {
        int = 1;
        dictLevel2 =         {
            int = 2;
            dictLevel3 =             {
                a = [ 1, 2 ];
            };
            newInt = 3;
        };
    };
}

Adding UIViews to storyboards

A little gem of a post about adding views to a storyboard.

iOS Freemium Conversion Rate

The Rebus Show Free is a free iOS app that exists along side The Rebus Show which sells for $1.99. In the last 90 days, the free app's conversion rate of people purchasing the $1.99 upgrade is 7.3%. In the same period, the paid app earned about 20% more than the free app.

clang: error: unable to execute command: posix_spawn failed: Resource temporarily unavailable

Too many processes - restarting fixes.

Convert Storyboard from iPhone to iPad

This posting saved me a lot of time when creating an iPhone app from an existing iPad app. The comments contain useful info too.

UIImage imageNamed does not resolve device based names when the image name contains a period.

UIImage imageNamed does not resolve device based names when the image name contains a period.


Given an image named "ab~ipad.png" [UIImage imageNamed:@"ab"] WORKS

Given an image named "a.b~ipad.png" [UIImage imageNamed:@"a.b"] RETURNS NULL