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2014/10/15 ¤U¤È 10:04:51
iphone Programming Glossary: calculationhttp://stackoverflow.com/questions/1204000/iphone-uilabel-sizewithfont objective c fonts uilabel share improve this question Instead of CGFLOAT_MAX for the max height of your text calculation try getting the size of one line with this _price.text sizeWithFont _price.font .height and then multiplying that by the..
Common multithreading mistakes beginners make on iPhone http://stackoverflow.com/questions/1357108/common-multithreading-mistakes-beginners-make-on-iphone in Cocoa must be done on the main thread or instability can result. If you have a background thread performing a calculation make sure to wrap whatever method updates the UI in a performSelectorOnMainThread withObject waitUntilDone method call...
iPhone App floating point calculations when released to the app store. http://stackoverflow.com/questions/14210621/iphone-app-floating-point-calculations-when-released-to-the-app-store App floating point calculations when released to the app store. I released my first solo iPhone app last week that calculates 12V Marine and Boat Battery.. comfortable all was well I archived the app and released it to Apple. When users started using the app they noted a calculation was not working as expected. The below code which is a method on a NSManagedObject model was producing a DIFFERENT output..
Is there a way to programmatically scroll to a PDF page within a UIWebView? http://stackoverflow.com/questions/1927841/is-there-a-way-to-programmatically-scroll-to-a-pdf-page-within-a-uiwebview NSString stringWithFormat @ scrollTo 0 d self.offset 2 Some observations The offset calculation isn't page perfect. If the PDF document isn't 8.5 x 11 e.g. A4 then the offset error gets worse more quickly. The self.currentPage..
dynamic calculation of UILabel width in UITableViewCell http://stackoverflow.com/questions/1947970/dynamic-calculation-of-uilabel-width-in-uitableviewcell calculation of UILabel width in UITableViewCell I am building a custom in application settings view based on UITableViewCellStyle1..
how to calculate two coordinates distance in objective c? http://stackoverflow.com/questions/1980898/how-to-calculate-two-coordinates-distance-in-objective-c c as title how to i have tried the code from google earth but seem like the result is different with the google map calculation result. below provided the code i did double GetDistance double lat1 long1 double lng1 la2 double lat2 long2 double lng2..
Check if UIColor is dark or bright? http://stackoverflow.com/questions/2509443/check-if-uicolor-is-dark-or-bright http www.w3.org WAI ER WD AERT #color contrast If you're only doing black or white text use the color brightness calculation above. If it is below 125 use white text. If it is 125 or above use black text. edit 1 bias towards black text. edit 2 The..
http://stackoverflow.com/questions/2950309/viewwillappear-for-subviews it does not seem to get called. Thanks. iphone uiview uiscrollview share improve this question You have to do the calculation yourself. Implement scrollViewDidScroll in your scroll view delegate and calculate manually which views are visible e.g...
What causes this error? “CALayer position contains NaN: [240 nan]” http://stackoverflow.com/questions/3025176/what-causes-this-error-calayer-position-contains-nan-240-nan Decided to take this out of comments and put it as an answer since I think it's a darned good answer Ha I had an NaN calculation div0 too. Key debugging aid the message in question is output by NSLog so set a breakpoint on NSLog and watch what the OS..
How to get screen size using code? http://stackoverflow.com/questions/3635483/how-to-get-screen-size-using-code to get screen size using code I would like to get the iphone screen size to give calculation but I did not found any documentation how to get it. Would you please figure it out for me Thanks iphone cocoa touch xcode..
Levenshtein Distance Algorithm better than O(n*m)? http://stackoverflow.com/questions/4057513/levenshtein-distance-algorithm-better-than-onm but of course that is a trade secret. I am building an iPhone app which I would like to use the Levenshtein distance calculation. There is an objective c implementation available but with the limited amount of memory on iPods and iPhones I'd like to..
Find the tangent of a point on a cubic bezier curve (on an iPhone) http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone to find the tangents. Finally at the bottom is a code block containing only the two routines you need for the calculation and nothing else. Hope this helps someone in the future. MBBezierView.m original BY MICHAL stackoverflow #4058979 #import.. points CGFloat C1 d 3.0 c 3.0 b a CGFloat C2 3.0 c 6.0 b 3.0 a CGFloat C3 3.0 b 3.0 a CGFloat C4 a not needed for this calculation finally it is easy to calculate the slope element using those coefficients return 3.0 C1 t t 2.0 C2 t C3 note that this.. the result is identical. of course you could calculate the four 'coefficients' only once for both this and the slope calculation CGFloat C1 d 3.0 c 3.0 b a CGFloat C2 3.0 c 6.0 b 3.0 a CGFloat C3 3.0 b 3.0 a CGFloat C4 a it's now easy to calculate the..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now loop. These updates are performed on the main thread so anything that runs for a long time in the main thread lengthy calculations etc. will prevent the interface updates from being started. Additionally anything that runs for a while on the main thread.. queue ^ Do some work dispatch_async main_queue ^ Update the UI The Do some work part of the above could be a lengthy calculation or an operation that loops over multiple values. In this example the UI is only updated at the end of the operation but..
Calculate new coordinate x meters and y degree away from one coordinate http://stackoverflow.com/questions/6633850/calculate-new-coordinate-x-meters-and-y-degree-away-from-one-coordinate Unfortunately there's no such function provided in the api so you'll have to write your own. This site gives several calculations involving latitude longitude and sample JavaScript code. Specifically the section titled Destination point given distance.. self degreesFromRadians toLonRadians return result In the JS code it contains this link which shows a more accurate calculation for distances greater than 1 4 of the Earth's circumference. Also note the above code accepts distance in km so be sure..
When an iOS application goes to the background, are lengthy tasks paused? http://stackoverflow.com/questions/6650717/when-an-ios-application-goes-to-the-background-are-lengthy-tasks-paused background my app's execution is just in the middle of a method For e.g. my app is doing for int i 1 to 10000K do some calculation When i 500K user switches to another app. What happens to the for loop in my app iphone multitasking share improve this..
http://stackoverflow.com/questions/728704/resizing-uitextview setFont UIFont systemFontOfSize 14 textView setFrame CGRectMake 5 30 100 size.height 10 or you can do the height calculation first and avoid the setFrame line UITextView textView UITextView alloc initWithFrame CGRectMake 5 30 100 size.height 10..
http://stackoverflow.com/questions/982476/iphone-app-without-appstore apps with out the app store Apple taking a 40 cut of a 99c iFart app is one thing but this is a 3000 engineering calculation app. We have also heard of the hassles some people have had getting apps approved. Can we sell an iPod touch I understand..
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