//Color did change block declaration
    NKOColorPickerDidChangeColorBlock colorDidChangeBlock = ^(UIColor *color){
        //Your code handling a color change in the picker view.
    };

    NKOColorPickerView *colorPickerView = [[NKOColorPickerView alloc] initWithFrame:CGRectMake(0, 0, 300, 340) color:[UIColor blueColor] andDidChangeColorBlock:colorDidChangeBlock];

    //Add color picker to your view
    [self.view addSubview:colorPickerView];