【发布时间】:2014-05-15 18:47:15
【问题描述】:
这段代码没有给出任何错误,但它没有创建“plist”文件,也没有从中读取。
我编写了一个代码,指定了文件夹的直接路径,它创建并写入文件,尽管它无法从中读取。
[NSKeyedArchiver archiveRootObject:employees toFile:@"/Users/Documents/employees.plist"];
下面的这段代码不能读写文件。
然后我逐行按照在线说明进行操作。
我复制了准确的 Employee.h 和 Employee.m 文件,也没有错误。
感谢您的帮助。
#import <Foundation/Foundation.h>
#import "Employee.h"
NSString* getPropertyListPath() {
NSURL *documentDir = [[NSFileManager defaultManager]
URLForDirectory:NSDocumentationDirectory
inDomain:NSUserDomainMask
appropriateForURL:nil
create:NO
error:nil];
NSURL *plist = [documentDir URLByAppendingPathComponent:@"EmployeeFile.plist"];
return plist.path;
}
void createAndArchiveObjects (NSString *filePath) {
NSLog(@"Creating objects manually");
Employee *john = [[Employee alloc] init];
[john setFirstName:@"A"];
[john setLastName:@"J"];
[john setEmployeeNumber:12345];
[john setHireDate:[NSDate date]];
NSMutableArray *employees = [[NSMutableArray alloc] init];
[employees addObject:john];
[NSKeyedArchiver archiveRootObject:employees toFile:filePath];
NSLog(@"Objects created and archived");
}
void unarchiveSavedObjects(NSString *filePath) {
NSMutableArray *employees = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
for (Employee *e in employees) {
NSLog(@"The unarchived, reconstituted object is %@", e);
}
}
int main(int argc, const char * argv[])
{
@autoreleasepool {
NSString *path = getPropertyListPath();
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
unarchiveSavedObjects(path);
} else {
createAndArchiveObjects(path);
}
}
return 0;
}
NSLog 显示:
Creating objects manually
Objects created and archived
但是没有创建文件。
【问题讨论】:
标签: objective-c nskeyedarchiver nskeyedunarchiver