For object-c @ protocol, object-c @ protocol

For object-c @ protocol, object-c @ protocol

Understanding from the java perspective

@ Protocol is equivalent to java interface definition, and the usage is the same

 

The following is an example of a test.

 

@protocol mytestClass <NSObject>- (void) callback:(int) num;@end@interface DiscoveryController : UIViewController<mytestClass>{    UIImageView *imageView;    }-(UIImage *) getImageFromURL:(NSString *)fileURL;@end

Protocol is defined here and

DiscoveryController implements this interface

@interface MyCallBack : NSObject{    id<mytestClass> deleage;}@property(nonatomic,retain) id<mytestClass> deleage;- (void)setRun;@end

　　

In MyCallBack, save

Call back the deleage when necessary.

//// MyCallBack. m // ACMobile // Created by mr. liang on 15/1/22. // Copyright (c) 2015 mr. liang. all rights reserved. // # import "MyCallBack. h "@ implementation MyCallBack @ synthesize deleage;-(void) runThread {NSLog (@" I am running "); [NSThread sleepForTimeInterval: 2]; [deleage callback: 1];} -(void) setRun {NSThread * callbackthread = [[NSThread alloc] initWithTarget: self selector: @ selector (runThread) object: nil]; [callbackthread start];} @ end

Asynchronous callback through threads makes the program more intuitive.

    MyCallBack *vv = [[MyCallBack alloc] init];    vv.deleage = self;    [vv setRun];

You need to use the protocol to implement this protocol and transmit the pointer;

 

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