I am programming for iOS, and using ARC.
I am trying to use a c-array as property, but it reports error.
@property (strong, nonatomic)NSString *mappingTable[70][254];
The error is "Property cannot have array or function type NSString *[70][254]". How can I solve this problem? How can I declare c-array as property?
Note:
This is a two dimensional array, I think it is much easier to just use c-array, so I didn't use NSArray for it.
Surprised this hasn't been suggested already but you can store the c-array in an NSData object. I just used this method to store an array of frames.
@property (nonatomic) NSData *framesArray;
// Create and initialize your c-style frames array
CGRect frames[numberOfFrames];
...
self.framesArray = [NSData dataWithBytes:frames length:(sizeof(CGRect) * numberOfFrames)];
// To Access the property
NSUInteger arraySize = [self.framesArray length] / sizeof(CGRect);
CGRect *frames = (CGRect *) [self.framesArray bytes];
You can't declare it in that format. As the error message states you can't use C-style arrays in property declarations.
The new shorter syntax for arrays makes NSArray and NSMutableArray less of a pain. Instead of
[array objectAtIndex:3]
you can simply use
array[3]
I think in the long run the benefit of using Objective-C objects will outweigh the comfort of using C-style arrays.
you can not declare c/c++ arrays as properties, you could either use objective-c NSArray/NSMutableArray for property or you could declare c++ array.
@property (strong,nonatomic)NSArray *mappingTable;
or declare pure c style character array like this
char mappingTable[70][224];
If you are only going to use it as a private property of the class. Then keep it simple. skip the YourClass.h file. And write it directly in the YourClass.m file like this.
//YourClass.m file
#import "YourClass.h"
@interface YourClass()
@property (strong,nonatomic)NSArray *mappingTable;
@end
@implementation YourClass
@synthesize mappingTable;
@end
NSArrayor declare pure c++ array