objc_setAssociatedObject通过alert传值

最新推荐文章于 2016-11-08 18:19:21 发布

yaoliangjun306

最新推荐文章于 2016-11-08 18:19:21 发布

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分类专栏： iOS

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本文详细介绍了如何在Objective-C中使用UIAlertView展示消息框，并通过设置关联对象来传递数据，包括UIAlertView的基本用法、如何加载视图、设置消息内容、取消按钮和额外按钮，以及如何获取传递的数据。

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#import "ViewController.h"  
#import <objc/runtime.h>  
static char alertInfoKey;  
@interface ViewController ()  
@end  
@implementation ViewController  
- (void)viewDidLoad  
{  
    [super viewDidLoad];  
    
    NSString* dataYouWantToPass = @"some info";  
    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"hello" message:@"miss-chalk" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"YES", nil];  
    [alert show];  
    objc_setAssociatedObject(alert, &alertInfoKey, dataYouWantToPass, OBJC_ASSOCIATION_RETAIN);  
    // Do any additional setup after loading the view, typically from a nib.  
}  
- (void)didReceiveMemoryWarning  
{  
    [super didReceiveMemoryWarning];  
    // Dispose of any resources that can be recreated.  
}  
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex  
{  
    NSString* data = objc_getAssociatedObject(alertView, &alertInfoKey);  
    NSLog(@"%@",data);  
}  
@end

运行结果：

2013-09-17 14:34:05.902 objc_setAssociatedObject--Test[2561:c07] some info