NSURL 文件扩展名添加等

发布于 2024-11-25 12:10:46 字数 516 浏览 1 评论 0原文

我从 savePanel 工作表收到了一个 URL，我想执行以下操作：

检查它是否有扩展名
（如果有），将其删除，
则添加自定义扩展名
如果没有，

，然后添加自定义扩展名任何简单的方法这..我尝试了类似以下的方法，但它不起作用

if ( [tmp pathExtension] != @"xxx" )
   path = [tmp stringByAppendingFormat:@"xxx"];

……可能的解决方案如下

NSString *path;
NSURL *filepath;
fileurl = [sheet URL];
fileurl = [fileurl URLByDeletingPathExtension];
fileurl = [fileurl URLByAppendingPathExtension:@"yyy"];
path = [fileurl path];

原文

I have received a URL from the savePanel sheet and I would like to do following:

Check to see if it has an extension
if it does, remove it
add a custom extension
if it does not, then add a custom extension

Any simple way to do this.. I tried something like following but it does not work

if ( [tmp pathExtension] != @"xxx" )
   path = [tmp stringByAppendingFormat:@"xxx"];

OK... A possible solution as follows

NSString *path;
NSURL *filepath;
fileurl = [sheet URL];
fileurl = [fileurl URLByDeletingPathExtension];
fileurl = [fileurl URLByAppendingPathExtension:@"yyy"];
path = [fileurl path];

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一梦等七年七年为一梦 2024-12-02 12:10:46

这可以使用 NSString 的方法来实现。请注意，对于字符串比较，您必须使用 isEqualToString:，而不是 ==，它测试指针是否相等。

关于扩展使用：-(NSString *)pathExtension;。要删除扩展，请使用 -(NSString *)stringByDeletingPathExtension;。

在所有情况下，要添加扩展名，请使用以下示例组成新字符串：+(NSString *)stringWithFormat:。

所以：

NSString *finalString;
if([[tmp pathExtension] isEqualToString:@"xxx"]) {
    finalString = [tmp stringByDeletingPathExtension];
}
finalString = [NSString stringWithFormat:@"%@.yyy", finalString];

This can be achieved using NSString's methods. Note that for string comparison, you have to use isEqualToString:, not ==, which tests for pointers equality.

About the extension use : -(NSString *)pathExtension;. To remove the extension use -(NSString *)stringByDeletingPathExtension;.

In all cases to add an extension, compose a new string using for example : +(NSString *)stringWithFormat:.

So :

NSString *finalString;
if([[tmp pathExtension] isEqualToString:@"xxx"]) {
    finalString = [tmp stringByDeletingPathExtension];
}
finalString = [NSString stringWithFormat:@"%@.yyy", finalString];

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我是男神闪亮亮 2024-12-02 12:10:46

@user756245 在同一页面上给出的可行解决方案的替代方法，但使用不同的 NSString 方法：

NSString *finalString;
if([[tmp pathExtension] isEqualToString:@"xxx"]) {
    finalString = [tmp stringByDeletingPathExtension];
}

finalString = [finalString stringByAppendingPathExtension:@"yyy"];

An alternate approach to the workable solution given on this same page by @user756245 but using different NSString methods:

NSString *finalString;
if([[tmp pathExtension] isEqualToString:@"xxx"]) {
    finalString = [tmp stringByDeletingPathExtension];
}

finalString = [finalString stringByAppendingPathExtension:@"yyy"];

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生来就爱笑 2024-12-02 12:10:46

这是使用 URL 的 Swift 4.1 更新

// assuming you are building an URL from string
let url = URL(string: "file.abc")!
let finalUrl = url.deletingPathExtension().appendingPathExtension("mp3")
let finalString = finalUrl.path // output "file.mp3"

Here is an update for Swift 4.1 using URL

// assuming you are building an URL from string
let url = URL(string: "file.abc")!
let finalUrl = url.deletingPathExtension().appendingPathExtension("mp3")
let finalString = finalUrl.path // output "file.mp3"

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~没有更多了~