[iOS] Pass optional block or closure to a function in Swift
古時候objective-c 寫法:
- (void)hardProcessingWithString:(NSString *)input withCompletion:(void (^)(NSString *result))block; [object hardProcessingWithString:@"commands" withCompletion:^(NSString *result){ NSLog(result); }];
swift 寫法:
func hardProcessingWithString(input: String, completion: (result: String) -> Void) { ... completion("we finished!") }
加入紅色框框處就做完了,結束,在爸爸的主程式準備一個
func imageUploadComplete(ret: String) { print("Hello:" + ret) }
在副程式存取 completion:
completion(dataString!)
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