Macros.h

static inline BOOL IsEmpty(id thing) {
    return thing == nil
        || ([thing respondsToSelector:@selector(length)]
        && [(NSData *)thing length] == 0)
        || ([thing respondsToSelector:@selector(count)]
        && [(NSArray *)thing count] == 0);
}

static inline NSString *StringFromObject(id object) {
	if (object == nil || [object isEqual:[NSNull null]]) {
		return @"";
	} else if ([object isKindOfClass:[NSString class]]) {
		return object;
	} else if ([object respondsToSelector:@selector(stringValue)]){
		return [object stringValue];
	} else {
		return [object description];
	}
}

// example usage: UIColorFromHex(0x9daa76)
#define UIColorFromHex(hexValue) [UIColor colorWithRed:((float)((hexValue & 0xFF0000) >> 16))/255.0 green:((float)((hexValue & 0xFF00) >> 8))/255.0 blue:((float)(hexValue & 0xFF))/255.0 alpha:1.0]
#define UIColorFromRGBA(r,g,b,a) [UIColor colorWithRed:r/255.0 green:g/255.0 blue:b/255.0 alpha:a]
#define UIColorFromRGB(r,g,b) UIColorFromRGBA(r,g,b,1.0)

#define LOG(fmt, ...) NSLog(@"%s:%d (%s): " fmt, __FILE__, __LINE__, __func__, ## __VA_ARGS__)

#define IDARRAY(...) (id []){ __VA_ARGS__ }
#define IDCOUNT(...) (sizeof(IDARRAY(__VA_ARGS__)) / sizeof(id))

#define ARRAY(...) [NSArray arrayWithObjects: IDARRAY(__VA_ARGS__) count: IDCOUNT(__VA_ARGS__)]

#define DICT(...) DictionaryWithIDArray(IDARRAY(__VA_ARGS__), IDCOUNT(__VA_ARGS__) / 2)

//The helper function unpacks the object array and then calls through to NSDictionary to create the dictionary:
static inline NSDictionary *DictionaryWithIDArray(id *array, NSUInteger count) {
    id keys[count];
    id objs[count];
    
    for(NSUInteger i = 0; i < count; i++) {
        keys[i] = array[i * 2];
        objs[i] = array[i * 2 + 1];
    }
    
    return [NSDictionary dictionaryWithObjects: objs forKeys: keys count: count];
}
#define POINTERIZE(x) ((__typeof__(x) []){ x })
#define NSVALUE(x) [NSValue valueWithBytes: POINTERIZE(x) objCType: @encode(__typeof__(x))]

#ifdef DEBUG
    #define INFO(fmt, ...) LOG(fmt, ## __VA_ARGS__)
#else
    // do nothing
    #define INFO(fmt, ...) 
#endif

#define ERROR(fmt, ...) LOG(fmt, ## __VA_ARGS__)

#define NUM_INT(int) [NSNumber numberWithInt:int]

#define CENTER_VERTICALLY(parent,child) (parent.frame.size.height - child.frame.size.height) / 2
#define WIDTH(view) view.frame.size.width
#define HEIGHT(view) view.frame.size.height
#define X(view) view.frame.origin.x
#define Y(view) view.frame.origin.y

#define INDEX_PATH(a,b) [NSIndexPath indexPathWithIndexes:(NSUInteger[]){a,b} length:2]