无法从 .plist 读取数字或将数字保存到 .plist 中
我创建了一个名为properties.plist 的属性列表。然后我这样写：
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:@"speicherung.plist"];
NSMutableArray *plistData = [[NSMutableArray arrayWithContentsOfFile:finalPath] retain];
int a = [[plistData objectAtIndex:1] intValue];
NSLog(@"%i", a); // returns always 0 - Even If I set a other number in the plist
a = a + 1;
NSNumber *ff = [NSNumber numberWithInt:a];
[plistData insertObject:ff atIndex:1];
NSLog(@"%@", [plistData objectAtIndex:1]); // returns 1 - right, because 0 + 1 = 1
[plistData writeToFile:finalPath atomically:YES];
当我再次运行这段代码时，我总是在第一个 NSLog 中得到数字 0，在第二个 NSLog 中得到数字 1。为什么？
此代码适用于 iPhone。
I created a property list with the name propertys.plist. Then I wrote this:
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:@"speicherung.plist"];
NSMutableArray *plistData = [[NSMutableArray arrayWithContentsOfFile:finalPath] retain];
int a = [[plistData objectAtIndex:1] intValue];
NSLog(@"%i", a); // returns always 0 - Even If I set a other number in the plist
a = a + 1;
NSNumber *ff = [NSNumber numberWithInt:a];
[plistData insertObject:ff atIndex:1];
NSLog(@"%@", [plistData objectAtIndex:1]); // returns 1 - right, because 0 + 1 = 1
[plistData writeToFile:finalPath atomically:YES];
When I run this code again, I always get number 0 in the first NSLog and number 1 in the second. Why?
This code is for the iPhone.
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这是一个 NSNumber。因此，这个 ObjC 对象的地址被转换为整数并分配给
a，给出了奇怪的值。使用-intValue从中提取整数。This is an NSNumber. So the address of this ObjC object is converted to an integer and assigned to
a, giving the strange value. Use-intValueto extract an integer from it.