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#import <UIKit/UIKit.h> @interface BViewController : UIViewController @property(nonatomic,strong)void (^ returnStr) (NSString *str); - (void)returnStr:(void (^) (NSString *str))str; @end
1.首先要更正自己的一个观点，属性为block函数是能够被strong修饰的（自己不知道怎么搞的，一直以为其职能被assign修饰）
2.那就是关于block的传值了，直接代码
在A控制器中
- (IBAction)tiaoZhuan:(id)sender {
//A控制器中调用B控制器中带有block函数的方法
[self.BVC returnStr:^(NSString *str) {
self.label.text = str;
[self.view setNeedsDisplay];
}];
[self presentViewController:self.BVC animated:YES completion:nil];
}
在B控制器中 .h文件
#import <UIKit/UIKit.h> @interface BViewController : UIViewController //这里的block属性需要用strong修饰 @property(nonatomic,strong)void (^ returnStr) (NSString *str); - (void)returnStr:(void (^) (NSString *str))str; @end
.m文件
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"B-viewDidLoad");
UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
[button setTitle:@"返回" forState:UIControlStateNormal];
[button addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)returnStr:(void (^) (NSString *str))str {
self.returnStr = str;
//str(@"我是反回来的");
}
//返回函数
- (void)back:(UIButton *)sender {
self.returnStr(@"我是反回来的");
[self dismissViewControllerAnimated:YES completion:nil];
}
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原文地址：http://www.cnblogs.com/feiyudexingfu/p/4612472.html
