Question

任何人都可以帮我在swift中重写这段代码

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

HMSegmentedControl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

        }

我收到错误：“'（HMSegmentedControl，NSString，Int，Bool） - ＆gt; NSAttributedString'无法转换为'HMTitleFormatterBlock'”

Answer 1

你用swift和Objective-C做混合。

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

Answer 2

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

ObjC阻止在swift中

2 个答案: