2014/10/15 下午 10:11:24

iphone Programming Glossary: misunderstanding

iPhone: Layering a transparent openGL view on top of a UIView?

http://stackoverflow.com/questions/1394934/iphone-layering-a-transparent-opengl-view-on-top-of-a-uiview

the background color to UIColor clearColor I've set opaque to NO I've set glClearColor to 0.0 0.0 0.0 0.0. I think I'm misunderstanding misusing something related to blend modes but I'm not sure. Can anyone give me a bit of sample code which shows how to do..

iPhone simulator and applicationWillTerminate()

http://stackoverflow.com/questions/368021/iphone-simulator-and-applicationwillterminate

and the app is launched again hitting the home button does not call the delegate method. What is going on here Am I misunderstanding something fundamental iphone ios simulator share improve this question I suspect that it is being called but that you..

Subclassing NSOperation to be concurrent and cancellable

http://stackoverflow.com/questions/3859631/subclassing-nsoperation-to-be-concurrent-and-cancellable

assume that your subclass of NSOperation is called MyOperation just for ease of explanation. I'll explain what you're misunderstanding and then give a corrected example. 1. Running NSOperations concurrently Most of the time you'll use NSOperation s with an..

Memory leak in cellForRowAtIndexPath:

http://stackoverflow.com/questions/4359905/memory-leak-in-cellforrowatindexpath

this self.tableView cellForRowAtIndexPath indexPath So this is not only returning a pointer to a cell right Maybe I'm misunderstanding what this method is for. Is it possible to simply get a reference to a cell to change the accessoryView Thanks iphone objective..

Why is this OpenGL ES code slow on iPhone?

http://stackoverflow.com/questions/450042/why-is-this-opengl-es-code-slow-on-iphone

This has nothing to do with the texture size. I don't know why people rated up Nils. He seems to have a fundamental misunderstanding of the OpenGL pipeline. He seems to think that for a given triangle the entire texture is loaded and mapped onto that triangle...

Actual frequency of device motion updates lower than expected, but scales up with setting

http://stackoverflow.com/questions/5034411/actual-frequency-of-device-motion-updates-lower-than-expected-but-scales-up-wit

rebuild to use NSTimer and do my own polling but I'd like to understand why i'm seeing this in case i'm fundamentally misunderstanding the Core Motion framework. iphone cocoa touch intervals core motion share improve this question Okay here's a possible..

Trouble with loading a separate XIB for iPad or iPhone

http://stackoverflow.com/questions/5306346/trouble-with-loading-a-separate-xib-for-ipad-or-iphone

universal share improve this question I know that @indragie's answer is a very common one but it's a common misunderstanding that will cause you a lot more work than you actually need to do. As long as you name the xib files a certain way they will..

Is if (variable) the same as if (variable != nil) in Objective-C

http://stackoverflow.com/questions/535120/is-if-variable-the-same-as-if-variable-nil-in-objective-c

is that I don't understand how that line could crash since the if statement is meant to be checking for nil. Am I misunderstanding the way Objective C works or do line numbers in crash statements sometime have the wrong line in them objective c iphone..

isKindOfClass and NSStringFromClass disagree about UIApplicationDelegate

http://stackoverflow.com/questions/5364074/iskindofclass-and-nsstringfromclass-disagree-about-uiapplicationdelegate

of the class that I expected it to be. I didn't expect this test to be very useful but it turned out to reveal a misunderstanding that I have regarding Objective C. I first get a reference to the delegate. Then I log the class name of what comes back...

Am I abusing UIViewController Subclassing?

http://stackoverflow.com/questions/5691226/am-i-abusing-uiviewcontroller-subclassing

In trying to figure out why viewWillAppear wasn't being called in my app I came across what may be a gross misunderstanding I hold about the intended use of UIViewController subclasses. According to the following post viewWillAppear does not run.. instance that the controller's view points to and the hierarchy of subviews that it contains. It sounds like your misunderstanding is on this last point. A view controller should manage a single screenful of content. If you're using a single view controller..

Loading custom UIView from nib, all subviews contained in nib are nil?

http://stackoverflow.com/questions/7588066/loading-custom-uiview-from-nib-all-subviews-contained-in-nib-are-nil

picture of the situation at all iphone ios uiview interface builder nib share improve this question You may be misunderstanding how nib loading works. If you define a custom UIView and create a nib file to lay out its subviews you can't just add a..

iCloud basics and code sample [closed]

http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample

is something more up to date Related problem File structure Sandbox vs. Cloud Perhaps my main problem is a fundamental misunderstanding of how iCloud is supposed to work. When I create a new instance of an UIDocument I'll have to overwrite two methods. First..

iPhone GPS - Battery Draining Extremely Fast

http://stackoverflow.com/questions/8689626/iphone-gps-battery-draining-extremely-fast

minutes if there is location change. According to my developer this cannot be done It sounds like there's some sort of misunderstanding here. You can certainly fire up the GPS every 20 minutes to get a fix if that's what you want although you can't do that..

Dispelling the UIImage imageNamed: FUD

http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud

magnified the problem more than it should have been. whilst warning that On the speed front there is a general misunderstanding of what is going on. The biggest thing that imageNamed does is decode the image data from the source file which almost always..