转换Swift 3中的客观块

Question

转换swift 3中的目标块。

.h文件

 @property (nonatomic, copy) void (^clickHandler)(NSString* identifier, CAShapeLayer* layer);

.m文件

[_svgMapview setClickHandler:^(NSString* identifier, CAShapeLayer* layer) {
    NSString *countryName = [[NSLocale systemLocale] displayNameForKey:NSLocaleCountryCode value:identifier];
    NSLog(@"identifier = %@ & country:%@",identifier,countryName);
    layer.backgroundColor = [UIColor redColor].CGColor;
    layer.fillColor = [UIColor redColor].CGColor;     
}];

当我在线转换时，它看起来像这样...

svgMapview.clickHandler = {(_ identifier: String, _ layer: CAShapeLayer) -> Void in
    var countryName: String? = NSLocale.system.displayName(forKey: NSLocaleCountryCode, value: identifier)
    print("identifier = (identifier) & country:(countryName)")
    layer.backgroundColor = UIColor.red.cgColor
    layer.fillColor = UIColor.red.cgColor
}

但是，它在项目中不起作用。

Answer 1

我看到一个可以修复的错别字：

svgMapview.clickHandler = {(_ identifier: String?, _ layer: CAShapeLayer?) -> Void in
    guard let actualLayer = layer, let actualIdentifier = identifier
    {
         print("layer or identifier is nil for some unknown reason")
         return
    }
    // countryName is an optional and it should be immutable, too...
    if let countryName = NSLocale.system.displayName(forKey: NSLocaleCountryCode, value: identifier)
    {
         print("identifier = (actualIdentifier) & country:(countryName)")
         actualLayer.backgroundColor = UIColor.red.cgColor
         actualLayer.fillColor = UIColor.red.cgColor
    } else {
         print("couldn't get NSLocale country code")
    }
}

如果它仍然不起作用，则应尝试检查该处理程序是否在主（UI）线程上运行。

Answer 2

有一个网站，您可以轻松地将Objective -C代码转换为Swift： -

https://objectivec2swift.com/#/home/main