我无法将此行转换为Swift:
(void)authenticateLayerWithUserID:(NSString *)userID completion:(void (^)(BOOL success, NSError * error))completion { }
这是我在Swift中的界限:
func authenticateLayerWithUserID(userID: NSString) {(success: Bool, error: NSError?) -> Void in }
任何人都对我做得不正确的事情有所了解吗?
答案 0 :(得分:1)
我会使用"完成处理程序"来翻译Swift中的这种函数:
func authenticateLayerWithUserID(userID: NSString, completion: (success: Bool, error: NSError?) -> ()) {
if userID == "Jack" {
completion(success: true, error: nil)
}
}
并称之为:
authenticateLayerWithUserID("Jack", { (success, error) in
println(success) // true
})
修改强>
根据您的评论,这是一个类功能中的新示例,以及" if else":
class MyClass {
class func authenticateLayerWithUserID(userID: NSString, completion: (success: Bool, error: NSError?) -> ()) {
if userID == "Jack" {
completion(success: true, error: nil)
} else {
completion(success: false, error: nil)
}
}
}
MyClass.authenticateLayerWithUserID("Jack", completion: { (success, error) in
println(success) // true
})
MyClass.authenticateLayerWithUserID("John", completion: { (success, error) in
println(success) // false
})
答案 1 :(得分:1)
如果您想调用该方法,它将在Objective-C中显示(我认为您正在使用this:
[self authenticateLayerWithUserID:userIDString completion:^(BOOL success, NSError *error) {
if (!success) {
NSLog(@"Failed Authenticating Layer Client with error:%@", error);
}
}];
在Swift中
var c: MyClass = MyClass()
c.authenticateLayerWithUserID("user", completion: { (boolean, error) -> Void in
})