Objective c 将NSData objectiveC代码转换为swift时出错
我试着把目标C中的代码转换成SwiftObjective c 将NSData objectiveC代码转换为swift时出错,objective-c,swift,nsstring,nsdata,Objective C,Swift,Nsstring,Nsdata,我试着把目标C中的代码转换成Swift - (IBAction) sendMessage { NSString *response = [NSString stringWithFormat:@"msg:%@", inputMessageField.text]; NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]]; [outputS
- (IBAction) sendMessage {
NSString *response = [NSString stringWithFormat:@"msg:%@", inputMessageField.text];
NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]];
[outputStream write:[data bytes] maxLength:[data length]];
inputMessageField.text = @"";
}
下面是我的swift代码
@IBAction func sendMessage() {
var response = NSString.localizedStringWithFormat("msg:\(inputMessageField?.text)")
var data = NSData(Data :response , dataUsingEncoding:NSASCIIStringEncoding)
outputStream(write:data.bytes, maxLength:data.length);
inputMessageField?.text = ""
}
我得到一个错误,告诉我一个数据是一个额外的参数。请帮我解决这个问题。没有NSData(数据:响应,数据使用编码:NSASCIIStringEncoding)
方法。您可能正在寻找
let data =
response.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
您的整个代码应该如下所示:
let response = NSString.localizedStringWithFormat("msg:\(inputMessageField?.text)")
if let data = response.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) {
outputStream(write:data.bytes, maxLength:data.length);
inputMessageField?.text = ""
}
else {
println("could not convert response \"\(response)\" to NSData")
}
尽可能使用let,并检查可故障初始化器是否返回值,您要查找的方法是否不存在 你可以这样转换
var data = NSData(data :response.dataUsingEncoding(NSASCIIStringEncoding)!)
已更新 方法
outputStream.write()
需要UInt8[]
array,因此您必须将数据转换为UInt8[]array
你的代码应该是
@IBAction func sendMessage() {
var response = NSString.localizedStringWithFormat("msg:\(inputMessageField?.text)")
var data = NSData(Data :response , dataUsingEncoding:NSASCIIStringEncoding)
outputStream.write(UnsafePointer(data.bytes), maxLength:data.length)
inputMessageField?.text = ""
}
Thanku:)(write:UnsafePointer,maxLength:Int)->$T6与NSOutputstream不同。我从上面的代码中得到了这个错误。@Jeyanthu:应该可以这样做:
outputStream.write(UnsafePointer(data.bytes),maxLength:data.length)
。还要注意,写入流实际上可能比您提供的写入字节少。比较。(write:UnsafePointer,maxLength:Int)->$T6与NSOutputstream不同。我在上面的代码中得到了这个错误,这是因为outputstream
需要UInt8[]array
,请查看更新的代码以及您使用的方法outputstream(write())
需要3个参数,其中需要UnsafePointer
,但您不需要该方法写入流,您的缓冲区
只包含零,而不包含数据
中的字节。