2014/10/15 下午 10:10:14
iphone Programming Glossary: impactOptimized Image Loading in a UIScrollView http://stackoverflow.com/questions/1098234/optimized-image-loading-in-a-uiscrollview worst you might see empty UIImageViews showing up on the screen. First and foremost I'd be looking for things that are impacting the processor significantly as NSOperation alone should not interfere with the main thread. Secondly I'd be looking for.. and execution that might be causing locking and syncing issues which could interrupt the main thread and therefore impact scrolling. A few items to consider Try loading your ThumbnailView's with a single image at the start and disabling the NSOperation.. skip everything following the if loaded check. This will give you an immediate idea whether the NSOperation code is impacting performance. Keep in mind that scrollViewDidScroll can occur many times during the course of a single scroll action...
Core Data could not fullfil fault for object after obtainPermanantIDs http://stackoverflow.com/questions/11321717/core-data-could-not-fullfil-fault-for-object-after-obtainpermanantids your changes there and have your live contexts just merge from those DidSave notifications. Finally on the database impact of permanent IDs. It is OK to discard the MOC. The disk is hit and the metadata is changed but the objects are not persisted... disk then create 10000 objects then obtain persistent IDs release the MOC and look at the size again. If there is an impact you can try deleting the objects or run a vacuum on the database after large updates to see if that works. If you are going..
Communication between view controllers http://stackoverflow.com/questions/1880033/communication-between-view-controllers second level controllers. Is this normal in a professional application or would there be a significant memory impact for doing things this way i.e. no lazy loading I assume the advantage of the array is a reduction of loading times for the.. normal in a professional application Firstly you should limit your posts on SO to one question per post. The memory impact of a view controller itself is usually quite low. It needs just a few hundred bytes for its instance variables. The memory..
How can my iPhone Objective-C code get notified of Javascript errors in a UIWebView? http://stackoverflow.com/questions/193119/how-can-my-iphone-objective-c-code-get-notified-of-javascript-errors-in-a-uiwebv @ caller @ exception @ sid lineno frame functionName frame caller frame exception There is probably a large runtime impact for this as the debug delegate can also supply methods to be called for entering and exiting a stack frame and for executing..
Laying out & sizing of subviews in a UIViewController http://stackoverflow.com/questions/2037716/laying-out-sizing-of-subviews-in-a-uiviewcontroller settings above. If that fails there is nothing wrong in setting the view size within viewWillAppear the performance impact of doing it every time is negligible. If nothing else works there is always layoutSubviews there you could do manual layout..
Do I programatically add SubViews in ViewDidAppear, ViewDidLoad, ViewWillAppear, the constructor? http://stackoverflow.com/questions/2280423/do-i-programatically-add-subviews-in-viewdidappear-viewdidload-viewwillappear called it means that the iPhone is already ready to show the UIView to the user and anything heavy you do here will impact performance in a very visible manner like animations being delayed etc . ViewDidAppear Finally I use the ViewDidAppear to..
Are C/C++/ObjC/JS Apple's only allowed langauges for iPhone development? http://stackoverflow.com/questions/2603279/are-c-c-objc-js-apples-only-allowed-langauges-for-iphone-development today specifically bans any iPhone application not implemented in C C Objective C or JavaScript . The clear impact here is to the wide array of programs written in languages other than those. Is that your reading of the clause in the new..
iPhone Compiler Fails: No architectures to compile for http://stackoverflow.com/questions/3549478/iphone-compiler-fails-no-architectures-to-compile-for Same at project settings. Frameworks Add the SystemConfiguration.framework to your project. Not sure why this had any impact. Clean all targets. Build for the simulator. The long explanation for this can be found on our blog http longweekendmobile.com..
Understanding the memory consumption on iPhone http://stackoverflow.com/questions/363493/understanding-the-memory-consumption-on-iphone but that did not help. Is there a way to track memory usage 筂ebugger style line by line watching each statement 䏭 impact on memory usage What I have found so far I really am using that much memory. It is not easy to measure the real memory consumption..
How to keep an iPhone app running on background fully operational http://stackoverflow.com/questions/3762200/how-to-keep-an-iphone-app-running-on-background-fully-operational What I want to know is if there is a way to keep my app running on background fully operational doesn't matter the impact on battery's life. That way the user of my app can select from settings to keep alive the app whenever he wants and just..
What are the Dangers of Method Swizzling in Objective C? http://stackoverflow.com/questions/5339276/what-are-the-dangers-of-method-swizzling-in-objective-c clearly named functions in backtraces. Still swizzling can be difficult to debug because it's hard to remember what impact the swizzling is having. Document your code well even if you think you're the only one who will ever see it . Follow good..
What is the difference between -viewWillAppear: and -viewDidAppear:? http://stackoverflow.com/questions/5630649/what-is-the-difference-between-viewwillappear-and-viewdidappear called it means that the iPhone is already ready to show the UIView to the user and anything heavy you do here will impact performance in a very visible manner like animations being delayed etc . 3 ViewDidAppear Finally I use the ViewDidAppear..
How can I optimize the rendering of a large model in OpenGL ES 1.1? http://stackoverflow.com/questions/5718846/how-can-i-optimize-the-rendering-of-a-large-model-in-opengl-es-1-1 in your VBOs aligning your data to 4 byte boundaries etc. but the ones above are what I've found to have the largest impact in the tuning of my own OpenGL ES 1.1 application. Most of these points are covered well in the Best Practices for Working..
Save An Image To Application Documents Folder From UIView On IOS http://stackoverflow.com/questions/6821517/save-an-image-to-application-documents-folder-from-uiview-on-ios all good man. Don't harm yourself or others. You probably don't want to store these images in Core Data since that can impact performance if the data set grows too large. Better to write the images to files. NSData pngData UIImagePNGRepresentation..
How to lose margin/padding in UITextView? http://stackoverflow.com/questions/746670/how-to-lose-margin-padding-in-uitextview nameField.textAlignment UITextAlignmentLeft Align to the right for example and the UIEdgeInsetsMake seems to have no impact on the right edge at all. At very least using the .contentInset property allows you to place your fields with the correct..
Weak and strong property setter attributes in Objective-C http://stackoverflow.com/questions/7912555/weak-and-strong-property-setter-attributes-in-objective-c attributes in Objective C @property retain weak strong __attribute__ NSObject CFDictionaryRef myDictionary What is the impact and benefit I heard that weak is not available on iOS 4 and we need to use assign. Is weak similar to assign iphone ios..
iPhone - Setting background on UITableViewController http://stackoverflow.com/questions/898351/iphone-setting-background-on-uitableviewcontroller a viewDidLoad method since it only gets called rarely when the view actually loads and will therefore have negligible impact on performance. N.B. You should always use PNG images on the iPhone not JPEG or any other format. share improve this answer..
objective-c interface - declaring variable vs just property? http://stackoverflow.com/questions/9065417/objective-c-interface-declaring-variable-vs-just-property the same as this MyObject myObject void setMyObject MyObject anObject Declaring the ivar yourself has no real impact here. You still need to implement the methods somehow. If your named ivar is the same as the ivar @synthesize is using then..
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