2014/10/15 下午 10:14:18

iphone Programming Glossary: somevar

Core Data cannot resolve faults when object has “description” attribute?

http://stackoverflow.com/questions/2169252/core-data-cannot-resolve-faults-when-object-has-description-attribute

I try to do this id object someMutableArray objectAtIndex someIndex NSLog @ @ object if object isMemberOfClass B class someVar object.propertyFromB problem else if object isMemberOfClass A class someVar object.propertyFromA Question problem the line.. @ object if object isMemberOfClass B class someVar object.propertyFromB problem else if object isMemberOfClass A class someVar object.propertyFromA Question problem the line indicated with problem crashes. EDIT See below for resolution but would still..

iVars, With and Without self?

http://stackoverflow.com/questions/3318499/ivars-with-and-without-self

example if your property is a retained property as opposed to assigned there's a very significant difference between someVar nil and self.someVar nil The synthesized setter will properly release someVar before setting it to nil whereas in the first.. is a retained property as opposed to assigned there's a very significant difference between someVar nil and self.someVar nil The synthesized setter will properly release someVar before setting it to nil whereas in the first example you've now.. a very significant difference between someVar nil and self.someVar nil The synthesized setter will properly release someVar before setting it to nil whereas in the first example you've now leaked memory. This is just one example of the difference...

Invoke model method with block that will run on the main thread

http://stackoverflow.com/questions/4944363/invoke-model-method-with-block-that-will-run-on-the-main-thread

NSError handler run in the background on the default priority queue dispatch_async dispatch_get_global_queue 0 0 ^ id someVar theArg computeSomething NSError anError nil someVar transmuteSomehowUsing self error anError call the result handler block.. priority queue dispatch_async dispatch_get_global_queue 0 0 ^ id someVar theArg computeSomething NSError anError nil someVar transmuteSomehowUsing self error anError call the result handler block on the main queue i.e. main thread dispatch_async..