objective-c block的使用

这两天借助了block来完成一些功能，有感而发。。。

block基础请看戳这里

一、基本使用：

在 Define.h 文件中

//textview block ---- about me@property (nonatomic, strong) void(^endEditTextViewCell)(UITableViewCell* cell, MsgInputFieldView* textView);@property (strong, nonatomic) void (^completionHandler)(NSArray *);

在 Defind.m 文件中

<pre name="code" class="objc">- (id)initWithSelectedValue:(NSArray *)selectedValue          completionHandler:(void(^)(NSArray *selected))completionHandler

{

self.completionHandler = completionHandler;

}

</pre><pre name="code" class="objc">代码 chao.- (void)textViewDidEndEditing:(UITextView *)textView {    self.endEditTextViewCell(self,_aboutMeTextView);}

<pre name="code" class="objc"><span style="font-family: Arial, Helvetica, sans-serif;"></span><pre name="code" class="objc">代码 xxx.

- (void)doneClick:(id)sender{

    if(_completionHandler != nil)        self.completionHandler(tagList.selectedItem);    [self dismissViewControllerAnimated:YES completion:nil];}

在 implement.m 文件中

<pre name="code" class="objc">Define *define = [[Define alloc] init];

<span style="font-family: Arial, Helvetica, sans-serif;">[defind setEditingTextViewCell:^(UITableViewCell *editingcell, MsgInputFieldView *textView) {</span>

//start edit //do something as you like

<span style="white-space:pre"></span>//当上边的 代码 chao被执行，就会回调这里的代码

            }];

void (^completionHandler</span>)(NSArray *) = ^(NSArray *selected) {                //start edit                //do something as you like<pre name="code" class="objc"><span></span>//通过下方初始化的方式传入block，代码 xxx 被执行，这里的代码会被回调

};

LabelHobbyViewController *hobbyController = [[LabelHobbyViewController alloc] initWithSelectedValue:hobbyData completionHandler:completionHandler<span style="font-family: Arial, Helvetica, sans-serif;">];</span>

</pre><pre name="code" class="objc">