iphone - Is there a way to determine device orientation if view is loaded before [window makeKeyAndVisible] is called? -


view of uiviewcontroller loaded nib before [window makekeyandvisible] called in application:didfinishlaunchingwithoptions: cannot correct device orientation - i.e. self.interfaceorientation, [[uiapplication sharedapplication] statusbarorientation] , [[uidevice currentdevice] orientation] give me false orientation info i'm in portrait mode (ipad's default mode, think).

is there way work around problem? please don't need use accelerometer ;)

edit: interested on getting orientation info based on accelerometer reading: http://web.archive.org/web/20091111033649/http://blog.sallarp.com/iphone-accelerometer-device-orientation

it appears can't rely on [uidevice currentdevice].orientation until orientation changes first time. if so, hack getting raw accelerometer readings.

#define kupdatefrequency 30  // hz #define kupdatecount 15 // init after half second #define kfilteringfactor (1.0f / kupdatecount)  - (void)applicationdidfinishlaunching:(uiapplication *)app {     [uiaccelerometer sharedaccelerometer].updateinterval = (1.0 / kupdatefrequency);     [uiaccelerometer sharedaccelerometer].delegate = self;     accelerometercounter = 0;     ... }  - (void)accelerometer:(uiaccelerometer *)accelerometer didaccelerate:(uiacceleration *)accel {     // average out first kupdatecount readings     // acceleration_[xyz] ivars typed float     acceleration_x = (float)accel.x * kfilteringfactor + acceleration_x * (1.0f - kfilteringfactor);     acceleration_y = (float)accel.y * kfilteringfactor + acceleration_y * (1.0f - kfilteringfactor);     acceleration_z = (float)accel.z * kfilteringfactor + acceleration_z * (1.0f - kfilteringfactor);      accelerometercounter++;     if (accelerometercounter == kupdatecount)     {         [self initorientation];         [uiaccelerometer sharedaccelerometer].delegate = nil;     } }  - (void)initorientation {     // figure out orientation acceleration_[xyz] , set ui... }

original response:

does [uidevice currentdevice].orientation return correct orientation during applicationdidfinishlaunching:? if so, can set initial ui according orientation.

if property doesn't set until later time, might try experimenting performselector:afterdelay: initialize ui after small delay.

this code sample kendall's answer below, added here completeness:

[self performselector:@selector(getoriented) withobject:nil afterdelay:0.0f];

i'm not sure if zero-second delay sufficient -- means code getoriented run during first pass through event run loop. may need wait longer accelerometer readings register on uidevice.


Comments

Post a Comment

Popular posts from this blog

c++ - Is it possible to compile a VST on linux? -

for class project i'm attempting write vst plugin backed cuda. current cuda workflow on linux box, i'd prefer compile , link there. according wikipedia , should possible (i couldn't find steinberg documentation relevant linux) can't find makefile or instructions on how build if aren't using xcode or visual studio. i'm vst 3 sdk doesn't support linux. when try compile plugin under linux, error: ./base/source/fatomic.cpp:39:30: fatal error: libkern/osatomic.h: no such file or directory this issue caused following code in "vst3 sdk/base/source/fatomic.cpp" #if mac #include <libkern/osatomic.h> #if mac_os_x_version_min_required > mac_os_x_version_10_4 #define native_atomic_type (volatile int32_t*) #else #define native_atomic_type (int32_t*) #endif #elif windows #include <windows.h> #endif but hope compiling under linux work vst sdk 2.4. reading. jvstwrapper seems run on lin...
Read more

c# - SharpSVN - How to get the previous revision? -

i trying find efficient way previous revision of file text comparison using sharpsvn. using (svnclient c = new svnclient()) { c.authentication.defaultcredentials = new networkcredential( configurationmanager.appsettings.get("svnserviceusername") , configurationmanager.appsettings.get("svnservicepassword") , configurationmanager.appsettings.get("svnservicedomain") ); c.authentication.sslservertrusthandlers += new eventhandler<svnsslservertrusteventargs>(authentication_sslservertrusthandlers); collection<svnfileversioneventargs> fileversioncollection = new collection<svnfileversioneventargs>(); svnrevisionrange range = new svnrevisionrange(0, this.hooks.revision); svnfileversionsargs args = new svnfileversionsargs(); args.retrieveproperties = true; args.range = range; foreach (svnchangeitem item in log.changedpaths) { string path = this.repositorypath + it...
Read more

php cli reading files and how to fix it? -

while using php cli in ubuntu got apache web server cant read file can while using in browser. , error shows nothing , next used code testing purposes : <? $handle = fopen("testfile.txt", "r"); if ($handle) { while (($buffer = fgets($handle, 4096)) !== false) { echo $buffer; } if (!feof($handle)) { echo "error: unexpected fgets() fail\n"; } if(!is_readable($handle) { die("not readable"); } fclose($handle); } ?> how fix ? edit : after removing '@' before fopen got following error fopen(testfile.txt): failed open stream: no such file or directory in /var/www/log/ka.php on line 2 when run script through cli, uses shell's working directory, in opposition file's directory (which apache hands current directory). important you, since fopen call depends on relative path; , relative paths resolved relatively working directory, not script. to have script behave apache, eit...
Read more