Objective-C declares an array and access method of C language @ Property

Recently, in the program, you need to declare a one-dimensional array in the C language in the objective-C class:

@interface CArrayTest : NSObject{@private    BOOL testArray[4];    }@end

Declare attributes

@property(nonatomic,assign)BOOL testArray[4];

Will promptError: Property can not have array or function type boll [4]

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Correct practice: do not declare the property attribute, that is, do not use the system's set get method, manually add the set and get Methods

#import <Foundation/Foundation.h>@interface CArrayTest : NSObject{@private    BOOL testArray[4];    }- (void)setTestArray:(BOOL*)aTestArray;- (BOOL *)testArray;@end

Implementation in carraytest. m

#import "CArrayTest.h"@implementation CArrayTest- (void)setTestArray:(BOOL*)aTestArray{    if(aTestArray != NULL)    {        for(int i = 0; i < 4; ++i)        {            testArray[i] = aTestArray[i];        }    }}- (BOOL *)testArray{    return testArray;}@end

Test code:

// Test code: carraytest * test = [[carraytest alloc] init]; bool TMP [4] = {yes, no, yes, yes}; test. testarray = TMP; // or [test settestarray: TMP]; // output for (INT I = 0; I <4; ++ I) {If (Yes = test. testarray [I]) // or [test testarray] [I]; nslog (@ "yes"); else nslog (@ "no ");}

It is worth noting that:

In objective-C, the returned type cannot be an array of C language. Of course, the array name in C language is actually a corresponding type pointer pointing to the first address of the array,

So we use an array of the bool type, but the parameters and return values in the set and get methods must be bool * (pointer, pointing to the first address of the array)