Typedef in Objective C?


The typedef keyword lets you create new data types or redefine existing ones. After typedef’ing an unsigned char in the following example, we can use ColorComponent just like we would use char, int, double, or any other built-in type:

// main.m
#import <Foundation/Foundation.h>

typedef unsigned char ColorComponent;

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        ColorComponent red = 255;
        ColorComponent green = 160;
        ColorComponent blue = 0;
        NSLog(@"Your paint job is (R: %hhu, G: %hhu, B: %hhu)",
              red, green, blue);
    }
    return 0;
}
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