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2014/10/15 ¤U¤Č 10:14:20
iphone Programming Glossary: specifiedhttp://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region to correlate each other. It's ok when I zoom out and see the span delta values are increasing as specified in documentation. But suddenly I drag the map without zooming and delta values become 0.0. Can somebody..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an toDate NSDate resultDate options NSUInteger opts Returns as an NSDateComponents object using specified components the difference between two supplied dates . From the API documentation . Create 2 NSDate..
IOS 6 force device orientation to landscape http://stackoverflow.com/questions/12640870/ios-6-force-device-orientation-to-landscape after rotating the device back to portrait the orientation goes to portrait although I have specified in supportedInterfaceOrientations only UIInterfaceOrientationMaskLandscape . Why it happens Also NONE.. happens Also NONE of above 3 methods are getting called. Some useful data In my plist file I have specified 3 orientations all but upside down. The project was started in Xcode 4.3 IOS 5. All classes including..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone Pre multiplied RGBA 8 bits per component. The source image format will be converted to the format specified here by CGBitmapContextCreate. self setContext CGBitmapContextCreate void pixelData self.size.width.. memory allocated for the context for rendering will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage..
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view between a CALayer's position and anchorPoint properties. Basically the position of a layer is specified in terms of the location of the layer's anchorPoint. By default a layer's anchorPoint is 0.5 0.5 which..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self window makeKeyAndVisible When mainViewController is assigned to aController the self keyword is specified self.mainViewController aController However when the mainViewController 's frame is set the self keyword..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library implement an Objective C class or category. force_load path_to_archive Loads all members of the specified static archive library. Note all_load forces all members of all archives to be loaded. This option allows..
What are the sizes used for the iOS application splash screen? http://stackoverflow.com/questions/2634898/what-are-the-sizes-used-for-the-ios-application-splash-screen 1536w x 2008h iPad Retina “Landscape.png 2048w x 1496h Default.png Not recommended ”If you have not specified a Default PortraitUpsideDown.png file this file will take precedence. ”If you have not specified a Default.. specified a Default PortraitUpsideDown.png file this file will take precedence. ”If you have not specified a Default LandscapeLeft.png or Default LandscapeRight.png image file this file will take precedence...
Set the maximum character length of a UITextField http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield return newLength 25 NO YES Before the text field changes the UITextField asks the delegate if the specified text should be changed. The text field has not changed at this point so we grab it's current length.. has more than one character in it. Deleting single characters or cutting multiple characters is specified by a range with a non zero length and an empty string. Replacement is just a range deletion with a non..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store direct customers to either a single app all your apps or to a specific app with your company name specified. To send customers to a specific application http itunes.com apps appname To send customers to a list..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom I've run into though. During a pinch zooming event UIScrollView will take the view you specified in the viewForZoomingInScrollView delegate method and apply a transform to it. This transform provides..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app until the payload is removed. The home button is disabled and the device returns to the specified application automatically upon wake or reboot. Read more about it here https developer.apple.com library..
Can I use CGAffineTransformMakeRotation to rotate a view more than 360 degrees? http://stackoverflow.com/questions/542739/can-i-use-cgaffinetransformmakerotation-to-rotate-a-view-more-than-360-degrees the rotation into pieces. As an example the following code will spin a view once per second for a specified number of seconds. You can easily modify it to spin a view by a certain number of rotations or by some..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop would be a trivial matter to grab a image from the iPhone's camera or library scale it down to a specified height using a function equivalent to the Aspect Fill option of UIImageView entirely in code and then..
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone need to memcpy which will go through the data pointed to by the pointer and copy each byte up to a specified length . Try NSData data NSData dataWithContentsOfFile filePath NSUInteger len data length Byte byteData..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region values in regionDidChange delegate method results don't seem to correlate each other. It's ok when I zoom out and see the span delta values are increasing as specified in documentation. But suddenly I drag the map without zooming and delta values become 0.0. Can somebody please explain what is the reference point to these span..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an components NSUInteger unitFlags fromDate NSDate startingDate toDate NSDate resultDate options NSUInteger opts Returns as an NSDateComponents object using specified components the difference between two supplied dates . From the API documentation . Create 2 NSDate whose difference is the NSTimeInterval you want to break down...
IOS 6 force device orientation to landscape http://stackoverflow.com/questions/12640870/ios-6-force-device-orientation-to-landscape to rotate the device to see the data correctly. Another problem after rotating the device back to portrait the orientation goes to portrait although I have specified in supportedInterfaceOrientations only UIInterfaceOrientationMaskLandscape . Why it happens Also NONE of above 3 methods are getting called. Some useful data In.. only UIInterfaceOrientationMaskLandscape . Why it happens Also NONE of above 3 methods are getting called. Some useful data In my plist file I have specified 3 orientations all but upside down. The project was started in Xcode 4.3 IOS 5. All classes including xibs were created before Xcode 4.5 IOS 6 now I use the last..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone colorSpace return nil Create the bitmap context. Pre multiplied RGBA 8 bits per component. The source image format will be converted to the format specified here by CGBitmapContextCreate. self setContext CGBitmapContextCreate void pixelData self.size.width self.size.height RGBA_8_BIT bytesPerRow colorSpace.. Context not created Draw the image to the bitmap context. The memory allocated for the context for rendering will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get a pointer to the image pixelData associated..
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view the Core Animation Programming Guide explains the relationship between a CALayer's position and anchorPoint properties. Basically the position of a layer is specified in terms of the location of the layer's anchorPoint. By default a layer's anchorPoint is 0.5 0.5 which lies at the center of the layer. When you set the position..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self .applicationFrame window addSubview mainViewController view window makeKeyAndVisible When mainViewController is assigned to aController the self keyword is specified self.mainViewController aController However when the mainViewController 's frame is set the self keyword is not required mainViewController.view.frame UIScreen..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library ObjC Loads all members of static archive libraries that implement an Objective C class or category. force_load path_to_archive Loads all members of the specified static archive library. Note all_load forces all members of all archives to be loaded. This option allows you to target a specific archive. we can use force_load..
What are the sizes used for the iOS application splash screen? http://stackoverflow.com/questions/2634898/what-are-the-sizes-used-for-the-ios-application-splash-screen LandscapeRight.png 1024w x 748h iPad Retina “Portrait.png 1536w x 2008h iPad Retina “Landscape.png 2048w x 1496h Default.png Not recommended ”If you have not specified a Default PortraitUpsideDown.png file this file will take precedence. ”If you have not specified a Default LandscapeLeft.png or Default LandscapeRight.png image.. 2048w x 1496h Default.png Not recommended ”If you have not specified a Default PortraitUpsideDown.png file this file will take precedence. ”If you have not specified a Default LandscapeLeft.png or Default LandscapeRight.png image file this file will take precedence. This link to Apple's Developer Library is useful too. share..
Set the maximum character length of a UITextField http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield newLength textField.text length string length range.length return newLength 25 NO YES Before the text field changes the UITextField asks the delegate if the specified text should be changed. The text field has not changed at this point so we grab it's current length and the string length we're inserting minus the range length...
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store Creating an iTunes link is simple and can be made to direct customers to either a single app all your apps or to a specific app with your company name specified. To send customers to a specific application http itunes.com apps appname To send customers to a list of apps you have on the App Store http itunes.com apps developername..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom threads are involved . The view scaling is an issue with UIScrollView I've run into though. During a pinch zooming event UIScrollView will take the view you specified in the viewForZoomingInScrollView delegate method and apply a transform to it. This transform provides a smooth scaling of the view without having to redraw it..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app an app lock payload the device is locked to a single application until the payload is removed. The home button is disabled and the device returns to the specified application automatically upon wake or reboot. Read more about it here https developer.apple.com library ios featuredarticles iPhoneConfigurationProfileRef Introduction..
Can I use CGAffineTransformMakeRotation to rotate a view more than 360 degrees? http://stackoverflow.com/questions/542739/can-i-use-cgaffinetransformmakerotation-to-rotate-a-view-more-than-360-degrees or many multiples of a full rotation without having to split the rotation into pieces. As an example the following code will spin a view once per second for a specified number of seconds. You can easily modify it to spin a view by a certain number of rotations or by some number of radians. void runSpinAnimationWithDuration CGFloat..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop ahead of time in the conceptual phases of my design that it would be a trivial matter to grab a image from the iPhone's camera or library scale it down to a specified height using a function equivalent to the Aspect Fill option of UIImageView entirely in code and then crop off anything that did not fit within a passed CGRect...
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone work. If you want to copy the data from a pointer you also need to memcpy which will go through the data pointed to by the pointer and copy each byte up to a specified length . Try NSData data NSData dataWithContentsOfFile filePath NSUInteger len data length Byte byteData Byte malloc len memcpy byteData data bytes len This code..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region results don't seem to correlate each other. It's ok when I zoom out and see the span delta values are increasing as specified in documentation. But suddenly I drag the map without zooming and delta values become 0.0. Can somebody please explain what..
How do I break down an NSTimeInterval into year, months, days, hours, minutes and seconds on iPhone? http://stackoverflow.com/questions/1237778/how-do-i-break-down-an-nstimeinterval-into-year-months-days-hours-minutes-an NSDate startingDate toDate NSDate resultDate options NSUInteger opts Returns as an NSDateComponents object using specified components the difference between two supplied dates . From the API documentation . Create 2 NSDate whose difference is..
IOS 6 force device orientation to landscape http://stackoverflow.com/questions/12640870/ios-6-force-device-orientation-to-landscape correctly. Another problem after rotating the device back to portrait the orientation goes to portrait although I have specified in supportedInterfaceOrientations only UIInterfaceOrientationMaskLandscape . Why it happens Also NONE of above 3 methods.. . Why it happens Also NONE of above 3 methods are getting called. Some useful data In my plist file I have specified 3 orientations all but upside down. The project was started in Xcode 4.3 IOS 5. All classes including xibs were created..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone the bitmap context. Pre multiplied RGBA 8 bits per component. The source image format will be converted to the format specified here by CGBitmapContextCreate. self setContext CGBitmapContextCreate void pixelData self.size.width self.size.height.. bitmap context. The memory allocated for the context for rendering will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get..
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view the relationship between a CALayer's position and anchorPoint properties. Basically the position of a layer is specified in terms of the location of the layer's anchorPoint. By default a layer's anchorPoint is 0.5 0.5 which lies at the center..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self view window makeKeyAndVisible When mainViewController is assigned to aController the self keyword is specified self.mainViewController aController However when the mainViewController 's frame is set the self keyword is not required..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library archive libraries that implement an Objective C class or category. force_load path_to_archive Loads all members of the specified static archive library. Note all_load forces all members of all archives to be loaded. This option allows you to target..
What are the sizes used for the iOS application splash screen? http://stackoverflow.com/questions/2634898/what-are-the-sizes-used-for-the-ios-application-splash-screen Retina “Portrait.png 1536w x 2008h iPad Retina “Landscape.png 2048w x 1496h Default.png Not recommended ”If you have not specified a Default PortraitUpsideDown.png file this file will take precedence. ”If you have not specified a Default LandscapeLeft.png.. ”If you have not specified a Default PortraitUpsideDown.png file this file will take precedence. ”If you have not specified a Default LandscapeLeft.png or Default LandscapeRight.png image file this file will take precedence. This link to Apple's..
Set the maximum character length of a UITextField http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield length range.length return newLength 25 NO YES Before the text field changes the UITextField asks the delegate if the specified text should be changed. The text field has not changed at this point so we grab it's current length and the string length.. just means string has more than one character in it. Deleting single characters or cutting multiple characters is specified by a range with a non zero length and an empty string. Replacement is just a range deletion with a non empty string. share..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store and can be made to direct customers to either a single app all your apps or to a specific app with your company name specified. To send customers to a specific application http itunes.com apps appname To send customers to a list of apps you have on..
How do I reset after a UIScrollView zoom? http://stackoverflow.com/questions/448285/how-do-i-reset-after-a-uiscrollview-zoom is an issue with UIScrollView I've run into though. During a pinch zooming event UIScrollView will take the view you specified in the viewForZoomingInScrollView delegate method and apply a transform to it. This transform provides a smooth scaling..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app locked to a single application until the payload is removed. The home button is disabled and the device returns to the specified application automatically upon wake or reboot. Read more about it here https developer.apple.com library ios featuredarticles..
Can I use CGAffineTransformMakeRotation to rotate a view more than 360 degrees? http://stackoverflow.com/questions/542739/can-i-use-cgaffinetransformmakerotation-to-rotate-a-view-more-than-360-degrees having to split the rotation into pieces. As an example the following code will spin a view once per second for a specified number of seconds. You can easily modify it to spin a view by a certain number of rotations or by some number of radians...
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop of my design that it would be a trivial matter to grab a image from the iPhone's camera or library scale it down to a specified height using a function equivalent to the Aspect Fill option of UIImageView entirely in code and then crop off anything..
Why am I having to manually set my view's frame in viewDidLoad? http://stackoverflow.com/questions/6757018/why-am-i-having-to-manually-set-my-views-frame-in-viewdidload loads your view controller's view by calling loadView if it's defined or by loading the view from the NIB that was specified in initWithNibName bundle . If neither exists UIKit just loads an empty view. UIKit calls viewDidLoad once the view and..
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone a pointer you also need to memcpy which will go through the data pointed to by the pointer and copy each byte up to a specified length . Try NSData data NSData dataWithContentsOfFile filePath NSUInteger len data length Byte byteData Byte malloc len..
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