[英]How to convert this obj-c code to swift (NSArray with NSDictionary)
[英]obj-c to Swift convert code
因此,我試圖將一些obj-c代碼轉換為swift,但我陷入其中。 我該如何迅速做這樣的事情?
- (void)sometMethod:(NSString *)s {
NSString * crlfString = [s stringByAppendingString:@"\r\n"];
uint8_t *buf = (uint8_t *)[crlfString UTF8String];}
真正的問題是這條線
uint8_t *buf = (uint8_t *)[crlfString UTF8String];
您想對UTF-8緩沖區做什么? 通常,將字符串直接轉換為NSData
對象更為方便。 但是,您也可以將Obj-C代碼一一轉換為Swift。 這是兩個變體:
import Foundation
func appendCRLFAndConvertToUTF8_1(s: String) -> NSData {
let crlfString: NSString = s.stringByAppendingString("\r\n")
let buffer = crlfString.UTF8String
let bufferLength = crlfString.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
let data = NSData(bytes: buffer, length: bufferLength)
return data;
}
func appendCRLFAndConvertToUTF8_2(s: String) -> NSData {
let crlfString = s + "\r\n"
return crlfString.dataUsingEncoding(NSUTF8StringEncoding)!
}
let s = "Hello 😄"
let data1 = appendCRLFAndConvertToUTF8_1(s)
data1.description
let data2 = appendCRLFAndConvertToUTF8_2(s)
data2.description
data1 == data2
而且,如果您要遍歷UTF-8代碼單元而不處理緩沖區,請使用以下方法:
for codeUnit in String.utf8 {
println(codeUnit)
}
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