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2014/10/15 ¤U¤È 10:11:20
iphone Programming Glossary: measurehttp://stackoverflow.com/questions/1059101/font-size-in-pixels will be a bit larger than the font's point size so that lines of text don't crash into each other. If you need exact measurements and you probably do then you'll need to actually measure the font glyphs using the font metric information. You can.. of text don't crash into each other. If you need exact measurements and you probably do then you'll need to actually measure the font glyphs using the font metric information. You can do this by using NSString's UIKit additions which will let you..
What does the Tiler Utilization statistic mean in the iPhone OpenGL ES instrument? http://stackoverflow.com/questions/1287811/what-does-the-tiler-utilization-statistic-mean-in-the-iphone-opengl-es-instrumen opengl es instruments share improve this question The Tiler Utilization and Renderer Utilization percentages measure the duty cycle of the vertex and fragment processing hardware respectively. On the MBX Tiler Utilization typically scales..
iphone: Calculating battery life http://stackoverflow.com/questions/1469549/iphone-calculating-battery-life for changes to the battery level. It only reports a change at 5 increments up or down but you can use a timer and measure the time between two changes or initial battery level and first change . Here's how you register for the notifications Use..
http://stackoverflow.com/questions/165539/iphone-proximity-sensor
Measuring velocity via iPhone SDK http://stackoverflow.com/questions/1994018/measuring-velocity-via-iphone-sdk velocity via iPhone SDK I need to implement a native iPhone app to measure the velocity of the phone basically a speedometer . I know that you can do so via the CoreLocation API fairly easily but.. so via the CoreLocation API fairly easily but I am concerned about battery consumption since this is to be a real time measurement that could be used for up to a couple of hours at a time. My understanding is that while you are actively monitoring.. prototype that uses the LocationManager API. It works OK but the update cycle is far from ideal for a real time measurement of velocity. Depending on circumstances it can take up to 4 5 seconds sometimes to update. Cruising at a given speed..
How do you calculate the day of the year for a specific date in Objective C http://stackoverflow.com/questions/2080927/how-do-you-calculate-the-day-of-the-year-for-a-specific-date-in-objective-c
Detecting Acceleration in a car (iPhone Accelerometer) http://stackoverflow.com/questions/2733249/detecting-acceleration-in-a-car-iphone-accelerometer I have been trying to implement for longer than I would like to admit. It's steps are as follows 1 During calibration measure gravity as a vector instead of a size. Store that vector. 2 When the car initially moves forward take the vector of motion.. navigation systems combine a gyro and accelerometer. The reason you can't do this was given by Einstein Using a local measurement you can't distinguish between gravity and acceleration. You do have some useful non local information the assumption..
CTFramesetterSuggestFrameSizeWithConstraints sometimes returns incorrect size? http://stackoverflow.com/questions/3374591/ctframesettersuggestframesizewithconstraints-sometimes-returns-incorrect-size a while back. Your alternative is to use CTFramesetterCreateFrame with a path that is sufficiently high. Then you can measure the rect of the CTFrame that you get back. Note that you cannot use CGFLOAT_MAX for the height as CoreText uses a flipped..
How to measure distance between two iphone devices using bluetooth? http://stackoverflow.com/questions/3624945/how-to-measure-distance-between-two-iphone-devices-using-bluetooth to measure distance between two iphone devices using bluetooth I'd like to do something in the following using bluetooth. Measure..
Understanding the memory consumption on iPhone http://stackoverflow.com/questions/363493/understanding-the-memory-consumption-on-iphone each statement ™s 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 but after a lot of counting I think the memory consumption is really that high. My fault. I.. but after a lot of counting I think the memory consumption is really that high. My fault. I found no easy way to measure the memory used. The Memory Monitor numbers are accurate these are the numbers that really matter but the Memory Monitor..
Measuring time the vehicle takes to accelerate in iPhone http://stackoverflow.com/questions/4654864/measuring-time-the-vehicle-takes-to-accelerate-in-iphone time the vehicle takes to accelerate in iPhone How to measure time the vehicle takes to accelerate from 0 to 100 km h 0 60 mph in 400meters a quarter mile using iPhone accelerometer.. accelerometer distance share improve this question You can use the acceleration values from the accelerometer to measure the velocity. There is really good paper Implementing Positioning Algorithms Using Accelerometers which explains the errors.. position from the acceleration values. To get the time the vehicle takes to accelerate from 0 to 100 km h you have to measure the time until you reached a certain velocity. The main steps you have to take to get the velocity from the acceleration..
Iphone - when to calculate heightForRowAtIndexPath for a tableview when each cell height is dynamic? http://stackoverflow.com/questions/4823197/iphone-when-to-calculate-heightforrowatindexpath-for-a-tableview-when-each-cel
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 not harder to debug than multi threaded code. Conclusion Method swizzling is safe if used properly. A simple safety measure you can take is to only swizzle in load . Like many things in programming it can be dangerous but understanding the consequences..
track small movements of iphone with no GPS http://stackoverflow.com/questions/6158176/track-small-movements-of-iphone-with-no-gps ever using GPS. That is I can only use data provided by the gyroscope and the accelerometer. The distances I need to measure are rather small and the precision I'm looking for is 40 50cm ~2 feet at the very most. Is this possible If so what's the..
Distance moved by Accelerometer http://stackoverflow.com/questions/6645126/distance-moved-by-accelerometer
How can I locally detect iPhone clock advancement by a user between app runs? http://stackoverflow.com/questions/7122216/how-can-i-locally-detect-iphone-clock-advancement-by-a-user-between-app-runs cheat share improve this question CACurrentMediaTime mach_absolute_time Take a look at this questions iOS How to measure passed time independent of clock and time zone changes Calculating number of seconds between two points in time in Cocoa..
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