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  • iOS很重要的 block回调

    刚刚进入ios开发行业,发现开发中要用到大量的block回调,由此可见它的重要性。学习它之前我也是网上找的资料,推荐这篇文章http://blog.csdn.net/mobanchengshuang/article/details/11751671,我也是从这里得到一点启示。假设对block的使用还不熟悉建议先看我的block那篇文章。以下我用自己的project来解释一下block回调函数。

    一、先创建一个简单的xcodeproject


    ViewController.h文件

    //

    //  ViewController.h

    //  block回调

    //

    //  Created by pengxun523 on 14-4-16.

    //  Copyright (c) 2014 pengxun523. All rights reserved.

    //


    #import <UIKit/UIKit.h>


    @interface ViewController : UIViewController


    @property (weak, nonatomic) IBOutlet UIButton *btnOutlet;


    - (IBAction)btnClick:(UIButton *)sender;

    @end


    #import "ViewController.h"

    #import "ShowBtnColor.h"

    @interface ViewController ()


    @end


    @implementation ViewController


    - (void)viewDidLoad

    {

        [super viewDidLoad];

    }


    -(void)chargeMyIphone:(void(^)(void))finishBlock

    {


    }

    - (void)didReceiveMemoryWarning

    {

        [super didReceiveMemoryWarning];

        // Dispose of any resources that can be recreated.

    }

    - (IBAction)btnClick:(UIButton *)sender

    {

        CGRect temp = CGRectMake(_btnOutlet.frame.origin.x, _btnOutlet.frame.origin.y, _btnOutlet.frame.size.width+50, _btnOutlet.frame.size.height+20);

        

        [ShowBtnColor ChangeRootViewBtnRect:temp blockcompletion:^(UIColor *colorEnum) {

             /*函数回调 block运行时就会回到这里*/

            _btnOutlet.backgroundColor = colorEnum;

        }];

    }

    @end


    ShowBtnColor.h文件

    //

    //  ShowBtnColor.h

    //  block回调

    //

    //  Created by pengxun523 on 14-4-22.

    //  Copyright (c) 2014 pengxun523. All rights reserved.

    //


    #import <Foundation/Foundation.h>


    typedef void (^Changcolor)(UIColor *colorEnum); //定义一个block返回值void參数为颜色值

    @interface ShowBtnColor : NSObject


    //回调函数改变btn的颜色值

    + (void)ChangeRootViewBtnRect:(CGRect)rect blockcompletion:(Changcolor)Changcolorblock;

    @end



    //

    //  ShowBtnColor.m

    //  block回调

    //

    //  Created by pengxun523 on 14-4-22.

    //  Copyright (c) 2014 pengxun523. All rights reserved.

    //


    #import "ShowBtnColor.h"


    @implementation ShowBtnColor


    + (void)ChangeRootViewBtnRect:(CGRect)rect blockcompletion:(Changcolor)Changcolorblock

    {

        UIColor *temp = [UIColor greenColor];

        Changcolorblock(temp); //运行block 

    }

    @end

    执行结果

     当点击button时 



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  • 原文地址:https://www.cnblogs.com/zfyouxi/p/4275152.html
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