Assertions are a great tool. As an Objective-C programmer, I use
For various reasons, you sometimes can’t use
NSAssert in a block easily. I’m going to explain why and describe a new macro,
BlockAssert, which solves this.
Continue reading Presenting BlockAssert
Over the years I have tweaked which compiler warnings I use. There’s one in particular that I used to turn on but will turn off from now on:
GCC_WARN_SHADOW is essentially drawing your attention to you possibly doing something other than you intended. This is like most warnings, but the difference is that the behaviour
GCC_WARN_SHADOW is blocking is very useful.
Continue reading Against GCC_WARN_SHADOW
You probably know
CGRectMake, but did you know it’s not the only way to make rectangles? It’s not even the best way, really.
There’s also C99 initializer syntax.
The main advantage to the C99 syntax is that it gives you some very Objective-C like syntax, where the fields are close to the values rather than implied by positioning. (That’s not to say this is intentionally similar, or that it’s the only advantage. But it is nice.) It also provides type checking, and since fields are named it catches drifts in meaning that you otherwise wouldn’t catch.
It’s sometimes slightly more typing, but I use it everywhere now.
Continue reading C99 initializers
In my previous entry, I discussed when
id will be promoted to
instancetype. But now that I’ve explained this, I’d like to explain why you should understand this but not rely on it. Instead, you should use
Let me start with this bold statement, then I’ll back up and explain it: Use
instancetype whenever it’s appropriate, which is whenever a class returns an instance of that same class.
Continue reading Why you should use instancetype instead of id
instancetype is a special type that can be returned from an Objective-C method. It specifies that the return is an object of the same type as the receiving class. In some cases, the compiler promotes an
id return to an instancetype: For instance, despite the definition of
[[NSString alloc] init], the compiler knows that it returns an
Continue reading When is id promoted to instancetype?