Why would the following:
[object propertyName:propertyValue] cause the above exception in Xcode 4.3 and Lion, but object.propertyName=propertyValue would work just fine?
The @property in question is a simple float and I've also used @synthesize.
I'm relatively new to Objective C, but have quite a bit of experience in C#, and have been reading Aaron Hillegass' book on the topic where the two approaches are listed as synonymous, with the [...] being the preferred one.
The setter method is not named the same as the property. You want setPropertyName instead of propertyName when calling it as a method. The getter is still just the property name.
See How to write my own setter for an ivar for a good example.
When you use @property and @syntesize to declare variable, system write get and set methods for you. And on this you need use [object setPropertyName:propertyValue]. Also you can use object.propertyName=propertyValue but it's a C programming style.
