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How to use background thread in swift?
... 8.It gives error as "QOS_CLASS_BACKGROUND" return class and it is of type UInt32 and "dispatch_get_global_queue" requires 1st parameter as int so type error is coming.
– Zalak Patel
Oct 29 '14 at 12:43
...
Measure elapsed time in Swift
...tart.uptimeNanoseconds // <<<<< Difference in nano seconds (UInt64)
let timeInterval = Double(nanoTime) / 1_000_000_000 // Technically could overflow for long running tests
print("Time to evaluate problem \(problemNumber): \(timeInterval) seconds")
return theAnswer
}
Ol...
Changing specific text's color using NSMutableAttributedString in Swift
...utedStringWithColor(_ strings: [String], color: UIColor, characterSpacing: UInt? = nil) -> NSAttributedString {
let attributedString = NSMutableAttributedString(string: self)
for string in strings {
let range = (self as NSString).range(of: string)
attribute...
What is Type-safe?
...Just as easily could be a char[4] and an int, but the more common issue is uint vs. int).
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A type unsafe language allows the programmer to reference a pro...
Difference between == and ===
...!= operators test for value equality for number values (e.g., NSInteger, NSUInteger, int, in Objective-C and Int, UInt, etc. in Swift). For objects (NSObject/NSNumber and subclasses in Objective-C and reference types in Swift), == and != test that the objects/reference types are the same identical t...
Can a C++ enum class have methods?
...u were hoping that the code looks something like this:
enum class Fruit : uint8_t
{
Apple,
Pear,
Banana,
Strawberry,
bool IsYellow() { return this == Banana; }
};
...
But of course, it doesn't work, because enums can't have methods (and 'this' doesn't mean anything in the above conte...
How to generate random SHA1 hash to use as ID in node.js?
...o this client side in modern browsers, if you'd like
// str byteToHex(uint8 byte)
// converts a single byte to a hex string
function byteToHex(byte) {
return ('0' + byte.toString(16)).slice(-2);
}
// str generateId(int len);
// len - must be an even number (default: 40)
function...
How to force NSLocalizedString to use a specific language
...age:nil];
Enjoy...
For those who need a Swift version:
var bundleKey: UInt8 = 0
class AnyLanguageBundle: Bundle {
override func localizedString(forKey key: String,
value: String?,
table tableName: String?) -> String {
...
c/c++如何判断指针无效？如NULL,0xcccccccc,0xfeeefeee,野指针等 - C/C++ -...
...BadWritePtr, IsBadReadPtr
BOOL AFXAPI AfxIsValidAddress(const void* lp, UINT nBytes,
BOOL bReadWrite /* = TRUE */)
{
// simple version using Win-32 APIs for pointer validation.
return (lp != NULL && !IsBadReadPtr(lp, nBytes) &&
(!bReadWrite || !IsBadWritePtr((LPVOID)lp, nBytes)));
}
指针...
Why do we need boxing and unboxing in C#?
... can only be primitive values, like a bool, a byte, a 32-bit int, a 32-bit uint, etc. The Stack is both simple and fast. As variables are added they just go one on top of another, so the first you declare sits at say, 0x00, the next at 0x01, the next at 0x02 in RAM, etc. In addition, variables are o...