// DEFAULT SIZE INIT
JCCheckBox *ovalCheckBox = [JCCheckBox checkBox]; // default size 24 by 24
// SET STYLE
self.ovalCheckBox.checkBoxStyle = JCCheckBoxStyleOval; // square is the default
// CHANGE COLOR
self.ovalCheckBox.innerColor = [UIColor greenColor];
self.ovalCheckBox.outerColor = [UIColor greenColor];
// SET COMPLETION
self.ovalCheckBox.checkedCompletion = ^{
    NSLog(@"Checked");
};
self.ovalCheckBox.uncheckedCompletion = ^{
    NSLog(@"Unchecked");
};
[view addSubview:ovalCheckBox];