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| 关键词： nbsp BlockStudy ViewController TestBlock 杜甲 void Block plaincopyprint import StartBlock |
其实，iOS中的Block就是C++中的函数指针，实现方式都是一样的，下面贴出一个简单的实践。首先，创建一个回调的类BlockStudy.h[objc] view plaincopyprint?// // BlockStudy.h // BlockStudy // // Created by 杜甲 on 11/11/14. // Copyright (c) 2014 杜甲. All rights reserved. // #import <Foundation/Foundation.h> @interface BlockStudy : NSObject typedef void (^TestBlock)(); @property (nonatomic , strong) TestBlock testBlock; - (void)StartBlock; @end BlockStudy.m[objc] view plaincopyprint?// // BlockStudy.m // BlockStudy // // Created by 杜甲 on 11/11/14. // Copyright (c) 2014 杜甲. All rights reserved. // #import "BlockStudy.h" @implementation BlockStudy - (void)test { if (_testBlock) { _testBlock(); } } - (void)StartBlock { [self performSelector:@selector(test) withObject:nil afterDelay:2.0]; } @end 调用类ViewController.m[objc] view plaincopyprint?// // ViewController.m // BlockStudy // // Created by 杜甲 on 11/11/14. // Copyright (c) 2014 杜甲. All rights reserved. // #import "ViewController.h" #import "BlockStudy.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. BlockStudy *block = [[BlockStudy alloc] init]; block.testBlock = ^() { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Block学习" message:@"测试成功" delegate:self cancelButtonTitle:@"取消吧" otherButtonTitles:@"OK", nil nil]; [alert show]; }; [block StartBlock]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end |
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