How do I convert an NSString value to NSData?
如何将
1 2 | NSString* str = @"teststring"; NSData* data = [str dataUsingEncoding:NSUTF8StringEncoding]; |
1 2 3 | NSString *str = @"helowrld"; // This converts the string to an NSData object NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; |
你可以从这个链接带参考
的:
1 | NSData *data = [yourString dataUsingEncoding:NSUTF8StringEncoding]; |
然后
修正在回答关于null
6.注释和文档,官方的回答是,verifications,更新关于这一alleged null:去除
通过详实的datausingencoding:
Return Value
The result of invoking
dataUsingEncoding:allowLossyConversion: with NO as the second argument
通过详实的getcstring MaxLength编码:::::与cstringusingencoding
note that the data returned by
dataUsingEncoding:allowLossyConversion: is not a strict C-string since it does not have a NULL terminator
敏捷开发在未来的情况。
在转换从/到nsdata NSString的字符串
1 | var _nsdata = _nsstring.dataUsingEncoding(NSUTF8StringEncoding) |
Objective-C。
1 2 3 | NSString *str = @"test string"; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:str]; NSString *thatStr = [NSKeyedUnarchiver unarchiveObjectWithData:data]; |
斯威夫特:
1 2 3 | let str ="test string" let data = NSKeyedArchiver.archivedData(withRootObject: str) let thatStr = NSKeyedUnarchiver.unarchiveObject(with: data) as! String |
第一关,你应该使用
然后,
如果你将是迅速的,是从
1 2 3 | let myString ="test" let myData = myString.data(using: .utf8) print(myData) // Optional(Data) |
1 2 | NSString *str = @"hello"; NSData *data = [NSData dataWithBytes:str.UTF8String length:str.length]; |
Objective-C。
nsdata NSString):
1 2 | NSString* str= @"string"; NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding]; |
nsdata NSString):
1 | NSString* newStr = [[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding]; |
斯威夫特:
字符串到日期:
1 2 | var testString ="string" var somedata = testString.data(using: String.Encoding.utf8) |
数据字符串:
1 | var backToString = String(data: somedata!, encoding: String.Encoding.utf8) as String! |
1 2 | NSString *str = @"Banana"; NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:true]; |
Objective - C的
1 2 | NSString *str = @"Hello World"; NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO]; |
斯威夫特
1 2 | let str ="Hello World" let data = string.data(using: String.Encoding.utf8, allowLossyConversion: false) |