目标c代码如下所示：
- (void)signInAccountWithUserName:(NSString *)userName
password:(NSString *)password
completion:(void (^)(BOOL success))completionBlock
{
// Log into the account with `userName` and `password`...
// BOOL loginSuccessful = [LoginManager contrivedLoginMethod];
// Notice that we are passing a BOOL back to the completion block.
if (completionBlock != nil) completionBlock(loginSuccessful);
}
这个方法的用法是：
[self signInAccountWithUserName:@"Bob"
password:@"BobsPassword"
completion:^(BOOL success) {
if (success) {
[self displayBalance];
} else {
// Could not log in. Display alert to user.
}
}];
我如何在 Swift 中实现它？等效的实现是什么？
func signInAccount(username:NSString!, password:NSString!, completionBlock:((Bool)->())?) {
if completionBlock {
completionBlock!(true)
}
}
signInAccount("Bob", "BobPassword") {
(var success) in
println("\(success)")
};
signInAccount("Bob", "BobPassword", nil)
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