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// shortcut method for NSArray iterations
static void each_object(NSArray *objects, void (^block)(id object)) {
    for (id obj in objects) {
        block(obj);
    }
}

// shortcut to change each label attribute value
#define EACH_LABEL(ATTR, VALUE) each_object(self.labels, ^(UILabel *label) { label.ATTR = VALUE; });