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How to create directory automatically on SD card
I'm trying to save my file to the following location
FileOutputStream fos = new FileOutputStream("/sdcard/Wallpaper/"+fileName);
but I'm getting the exception java.io.FileNotFoundException
However, when I put the path as "/sdcard/" it works.
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Xcode debugging - displaying images
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EDIT:
As of Xcode 5, the debugger can show you the visual representation of UIImage/CGImageRef variables!
Xcode itself can't do it. I don't know about external tools.
What i'm doing to test images while debugging is to convert that raw data into an image-file format, like .png, and then savi...
How to get the Power of some Integer in Swift language?
...recedencegroups:
precedencegroup PowerPrecedence { higherThan: MultiplicationPrecedence }
infix operator ^^ : PowerPrecedence
func ^^ (radix: Int, power: Int) -> Int {
return Int(pow(Double(radix), Double(power)))
}
// ...
// Then you can do this...
let i2 = 2 ^^ 3
// ... or
print("2³ = \(...
How do you check that a number is NaN in JavaScript?
... If i were you i would assign it to a variable and , use condition variable !== variable . As it is laid out in specs tc39.github.io/ecma262/#sec-isnan-number
– allsyed
Jul 11 '16 at 5:43
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#ifdef #ifndef in Java
I doubt if there is a way to make compile-time conditions in Java like #ifdef #ifndef in C++.
8 Answers
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What is an “unwrapped value” in Swift?
I'm learning Swift for iOS 8 / OSX 10.10 by following this tutorial , and the term " unwrapped value " is used several times, as in this paragraph (under Objects and Class ):
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Fatal error: use of unimplemented initializer 'init(coder:)' for class
...initializers from the superclass if all the properties have a value (or optional) and the subclass has not defined any designated initializers.
Solution
1. First method
Manually implementing init?(coder aDecoder: NSCoder) on the target UIViewController
required init?(coder aDecoder: NSCoder) {
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Tool to generate JSON schema from JSON data [closed]
...or the JSON schema, that I can rework manually, adding things like description, required, etc, which can not be infered from the specific examples.
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Cannot create an NSPersistentStoreCoordinator with a nil model
...e mainBundle] URLForResource:@"[same with name of xcdatamodeld]" withExtension:@"momd"];
For anyone out there searching this error message and finding this thread....try this first.
You must make sure that where it says [same with name of xcdatamodeld]....that it is!!!
For some reason, mine had m...
ViewDidAppear is not called when opening app from background
...How can I call when I open my app. Do I have to do anything from applicationDidBecomeActive ?
8 Answers
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