nsnumber

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Objective C: Comparison issue between numbers

I am trying to implement the code snippet below. However I am unable to get my expected results. For example if my disanceFromLoc = 0.16, I am still getting my output as 0.16 km.[详细]

2023-03-05 23:00 分类：问答
Trouble setting number attribute in Core Data

I have an Entity \"Item\" in Core Data.Item has two attributes: name and number.name is an NSString* and number is an NSNumber*.I specified \"Integer 32\" as the type for number in the Core Data model[详细]

2023-03-05 13:55 分类：问答
how do I set the value of an NSNumber variable (without creating a new object) in objective-c

how do I set the value of an NSNumber variable (without creating a new object) in objective-c? Background[详细]

2023-03-05 01:26 分类：问答
Why is NSNumber immutable?

Why is NSNumber immutable? Was there a good reason? Because now I am thinking about creating my own class just for the sa开发者_开发百科ke of mutability.A number is a very basic data type. A number is[详细]

2023-03-01 20:53 分类：问答
Random Number Generation with Well44497a in C++

Sorry to bother again, but as I am new C++ I am having a lot of weird and silly problems. I am programing a MCMC method. I read in this forum that the WELL RNG was a good alternative to generate rand[详细]

2023-02-28 18:18 分类：问答
Converting NSNumber to float is throwing me "uncaught exception 'NSInvalidArgumentException'"

I am trying to take EXIF data from the iPhone to calculate brightness. I need to access two specific NSNumber\'s ExifExposureTime and ExifISOSpeed to be converted to floats, but when I try to convert[详细]

2023-02-28 13:42 分类：问答
When random number shows twice, my object crashes the iPhone app! :(

I\'m working on a nice app as per usual and then this happens! You spin the wheel of fortune in my app, and when the spinning animation is finished, the app is supposed to randomize a number, and disp[详细]

2023-02-27 14:27 分类：问答
How to tell Core Data's NSNumber property's type

I have an iOS 4 project using Core Data. When I design the Core Data Model, the attributes have Int开发者_如何转开发eger 64, Integer 32, Integer 16, Decimal, Double, Float, and Boolean.[详细]

2023-02-27 09:45 分类：问答
Unable to get the exact tag value of a UIView

I am trying to compare a view tag with another tag by using the following code for(UIView *subView in cardsContainerView.subviews){[详细]

2023-02-26 10:32 分类：问答
how should I perform calculations/updates to an NSNumber attribute in my Core Data entity?

So I understand you need NSNumber to save integers in Core Data. My question is what is the best technique for accessing the integers here, performing maths, and then updating?[详细]

2023-02-25 17:35 分类：问答