是否有任何方式来模拟[NSString stringWithFormat:@“%p”,myVar],从Objective-C,在新的Swift语言?
例如:
let str = "A String"
println(" str value \(str) has address: ?")
是否有任何方式来模拟[NSString stringWithFormat:@“%p”,myVar],从Objective-C,在新的Swift语言?
例如:
let str = "A String"
println(" str value \(str) has address: ?")
当前回答
就用这个吧:
print(String(format: "%p", object))
其他回答
这是为了Swift 3。
像@CharlieMonroe一样,我想以整数形式获取地址。具体来说,我想要Thread对象的地址作为诊断日志记录模块中的线程ID,用于没有线程名可用的情况。
根据查理·门罗的代码,这是我目前想出的。但注意,我对霉霉很陌生,这可能不正确……
// Convert the memory address of the current Thread object into an Int for use as a thread ID
let objPtr = Unmanaged.passUnretained(Thread.current).toOpaque()
let onePtr = UnsafeMutableRawPointer(bitPattern: 1)! // 1 used instead of 0 to avoid crash
let rawAddress : Int64 = onePtr.distance(to: objPtr) + 1 // This may include some high-order bits
let address = rawAddress % (256 * 1024 * 1024 * 1024) // Remove high-order bits
最后一条语句存在,因为如果没有它,我将获得像0x60000007DB3F这样的地址。最后一条语句中的模运算将其转换为0x7DB3F。
斯威夫特2
这现在是标准库的一部分:unsafeAddressOf。
/// Return an UnsafePointer to the storage used for `object`. There's
/// not much you can do with this other than use it to identify the
/// object
斯威夫特3
对于Swift 3,使用withUnsafePointer:
var str = "A String"
withUnsafePointer(to: &str) {
print(" str value \(str) has address: \($0)")
}
引用类型:
获取引用类型的内存地址是有意义的,因为它表示标识。 ===标识运算符用于检查两个对象是否指向同一个引用。 使用ObjectIdentifier获取内存地址
代码:
class C {}
let c1 = C()
let c2 = c1
//Option 1:
print("c1 address: \(Unmanaged.passUnretained(c1).toOpaque())")
//Option 2:
let o1 = ObjectIdentifier(c1)
let o2 = ObjectIdentifier(c2)
print("o1 -> c1 = \(o1)")
print("o2 -> c2 = \(o2)")
if o1 == o2 {
print("c1 = c2")
} else {
print("c1 != c2")
}
//Output:
//c1 address: 0x000060c000005b10
//o1 -> c1 = ObjectIdentifier(0x000060c000005b10)
//o2 -> c2 = ObjectIdentifier(0x000060c000005b10)
//c1 = c2
值类型:
获取值类型的内存地址的需求并不太重要(因为它是一个值),重点将更多地放在值的相等性上。
这当然不是最快或最安全的方法。但这对我很管用。这将允许任何nsobject子类采用此属性。
public extension NSObject {
public var memoryAddress : String? {
let str = "\(self.self)".components(separatedBy: ": ")
guard str.count > 1 else { return nil }
return str[1].replacingOccurrences(of: ">", with: "")
}
}
//usage
let foo : String! = "hello"
Swift.print(foo.memoryAddress) // prints 0x100f12980
我对Swift 3的解决方案
extension MyClass: CustomStringConvertible {
var description: String {
return "<\(type(of: self)): 0x\(String(unsafeBitCast(self, to: Int.self), radix: 16, uppercase: false))>"
}
}
这段代码创建的描述类似于默认描述 < MyClass: 0 x610000223340 >