objective-c - 不兼容的整数到指针的转换

Question

我正在检查目录是否存在，但我收到警告

不兼容的整数到指针转换将“BOOL”（又名“signed char”）发送到“BOOL *”类型的参数（又名“signed char *”）

 BOOL isFile ;
 isFile = [[NSFileManager defaultManager] fileExistsAtPath:[dirurl path] isDirectory:YES];

为什么我会收到此警告以及如何解决它

Answer 1

像这样使用：

BOOL isDir;
BOOL isFileExists;

isFileExists = [[NSFileManager defaultManager] fileExistsAtPath:[dirurl path] isDirectory:&isDir];
if (isDir) {...}

官方文档示例developer.apple.com：

NSArray *subpaths;
BOOL isDir;

NSArray *paths = NSSearchPathForDirectoriesInDomains
                     (NSLibraryDirectory, NSUserDomainMask, YES);

if ([paths count] == 1) {

    NSFileManager *fileManager = [[NSFileManager alloc] init];
    NSString *fontPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Fonts"];

    if ([fileManager fileExistsAtPath:fontPath isDirectory:&isDir] && isDir) {
        subpaths = [fileManager subpathsAtPath:fontPath];
// ...
[fileManager release];