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2014/10/15 ¤U¤È 10:15:06
iphone Programming Glossary: triphttp://stackoverflow.com/questions/10344637/capture-60fps-in-iphone-app again which is quite pointless and very wearing for the bus. Luckily AVFoundation has a class that removes this round trip AVCaptureMovieFileOutput . If you let AVFoundation do the writing for you then the iPhone4S can capture and encode frames..
How to find whether two objects intersect each other? http://stackoverflow.com/questions/11642947/how-to-find-whether-two-objects-intersect-each-other
Core Data: does a fetch have to make a trip to persistent store? http://stackoverflow.com/questions/13833529/core-data-does-a-fetch-have-to-make-a-trip-to-persistent-store Data does a fetch have to make a trip to persistent store Say I do this NSManagedObjectContext context #a managed object context NSString entityName #an entity.. ObjsWithName context executeFetchRequest requestForOne #do some work with the obj# Does the fetch in the loop incur a trip to the persistent store every time Or those fetches will only be performed in coredata's row cache EDIT I've written a fragment..
Web based method to determine if an iPhone is connected via 3G or Wifi http://stackoverflow.com/questions/1579795/web-based-method-to-determine-if-an-iphone-is-connected-via-3g-or-wifi wifi share improve this question You probably don't care about 3G vs WiFi as much as you do about bandwidth roundtrip time. I wonder if you can achieve this by not detecting 3G vs WiFi but by computing round trip time using a browser script.. do about bandwidth roundtrip time. I wonder if you can achieve this by not detecting 3G vs WiFi but by computing round trip time using a browser script and using that to determine the fidelity of the user experience. share improve this answer..
Network Activity Monitoring on iPhone http://stackoverflow.com/questions/19977759/network-activity-monitoring-on-iphone time at which a packet was received u_int32_t t_starttime time connection was established int t_rtttime round trip time tcp_seq t_rtseq sequence number being timed int t_rxtcur current retransmit value ticks u_int t_maxseg maximum segment.. timed int t_rxtcur current retransmit value ticks u_int t_maxseg maximum segment size int t_srtt smoothed round trip time int t_rttvar variance in round trip time int t_rxtshift log 2 of rexmt exp. backoff u_int t_rttmin minimum rtt allowed.. value ticks u_int t_maxseg maximum segment size int t_srtt smoothed round trip time int t_rttvar variance in round trip time int t_rxtshift log 2 of rexmt exp. backoff u_int t_rttmin minimum rtt allowed u_int32_t t_rttupdated number of times..
When is an autoreleased object actually released? http://stackoverflow.com/questions/2498330/when-is-an-autoreleased-object-actually-released app dispatchEvent event pool drain That while loops is similar to what the UIKit is actually doing and each trip through that while loop is like a trip through the runloop where the function getNextEvent blocks waiting for some event.. drain That while loops is similar to what the UIKit is actually doing and each trip through that while loop is like a trip through the runloop where the function getNextEvent blocks waiting for some event to happen. All of your methods are typically.. pool that aren't always at the end of the event loop. Sometimes you might allocate tens of thousands of objects in one trip thorough the event loop. When that happens you might setup additional inner auto release pools in your own methods to keep..
UIImageJPEGRepresentation - memory release issue http://stackoverflow.com/questions/2655769/uiimagejpegrepresentation-memory-release-issue share improve this question At the very least there's no point in allocating and releasing the image on every trip through the loop. It shouldn't leak memory but it's unnecessary so move the alloc init and release out of the loop. Also..
Should I use interface builder or not? http://stackoverflow.com/questions/2943734/should-i-use-interface-builder-or-not GUI tools things that generated code for them or some other mess. Then the problem becomes that it is hard to round trip the interface you cannot easily modify things once they are generated because of the complexity of pushing those changes..
What type of webservice works best with iOS? http://stackoverflow.com/questions/3152700/what-type-of-webservice-works-best-with-ios how you define the transactions of your protocol even with an efficient encoding if your protocol requires many round trips vs. a single round trip you'll still be slow. Lastly depending on the size of the data you're sending the overhead of an.. of your protocol even with an efficient encoding if your protocol requires many round trips vs. a single round trip you'll still be slow. Lastly depending on the size of the data you're sending the overhead of an encoding may be immaterial..
how to get distance using Wi-Fi http://stackoverflow.com/questions/684781/how-to-get-distance-using-wi-fi then this is still a hard problem. RF waves travel at the speed of light so using relay techniques to measure round trip signal propagation delay won't give good accuracy the receivers have to operate extremely fast and then there's multipath..
http://stackoverflow.com/questions/7720485/server-ping-with-iphone which of two servers responds fastest. One server is in my time zone the other is far away. How do I get the round trip time from a server ping on the iPhone I looked at Reachability and I don't think it does what I need in this case. Alternate..
wait_fences: failed to receive reply: 10004003 (Again) http://stackoverflow.com/questions/8994998/wait-fences-failed-to-receive-reply-10004003-again the loadView of Calc and some internal iOS activity. If I do too much work inside loadView then I cross the line and trip a wait_fences warning. And that the keyboard is a symptom and not the underlying cause. IE it could have been any activity..
http://stackoverflow.com/questions/932522/iphone-vs-android and this is a quality piece of hardware quite comparable in capability with the iPhone. Our cultural imperialism can trip us up sometimes and Apple have gotten a little too arrogant and overconfident recently. China has taught them a valuable..
http://stackoverflow.com/questions/9707883/gdb-vs-lldb-debuggers There's a quick intro for GDB users here http lldb.llvm.org tutorial.html However... You might want to take a trip over to the forums at developer.apple.com. There's a fair bit of rumbling about issues with LLDB at the moment in XCode..
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