swift中的ObjC块

有人能帮我用swift重写这段代码吗

    [segmentedControl1 setTitleFormatter:^NSAttributedString *(HMSegmentedControl *segmentedControl, NSString *title, NSUInteger index, BOOL selected) {
NSAttributedString *attString = [[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName : [UIColor blueColor]}];
return attString;
}];

HMC分段控制类的一部分：

    @interface HMSegmentedControl : UIControl
....
@property (nonatomic, copy) HMTitleFormatterBlock titleFormatter;
....
@end

typedef NSAttributedString *(^HMTitleFormatterBlock)(HMSegmentedControl *segmentedControl, NSString *title, NSUInteger index, BOOL selected);

我的代码是：

segmentedControl1.titleFormatter = {(segmentedControl: HMSegmentedControl, title: NSString, index: Int, selected: Bool) -> NSAttributedString in

        }

---

我得到一个错误：“'（HMSegmentedControl，NSString，Int，Bool）->NSAttributedString'不能转换为'HMTitleFormatterBlock'”

我理解了我的错误

var titleFormatterBlock: HMTitleFormatterBlock = {(control: AnyObject!, title: String!, index: UInt, selected: Bool) -> NSAttributedString in
    NSAttributedString *attString = [[NSAttributedString alloc] initWithString:title attributes:@{NSForegroundColorAttributeName : [UIColor blueColor]}];
    return attString;
}
segmentedControl.titleFormatter = titleFormatterBlock

---

你做了一个快速和客观的组合-C

let titleFormatterBlock: HMTitleFormatterBlock = {(control: AnyObject!, title: String!, index: UInt, selected: Bool) -> NSAttributedString in
            let attString = NSAttributedString(string: title, attributes: [NSForegroundColorAttributeName: UIColor.blueColor()
                ])
            return attString;
        }
segmentedControl.titleFormatter = titleFormatterBlock

---

可以显示声明

titleFormatter

属性的代码吗？如上所示。titleFormatter是HMSegmentedControls的属性，那么您的错误是什么？