简单的block入门

block的目的就是传值，今天写个最简单的block，希望看官看后有所启发.
界面2:
界面2.h

#import <Foundation/Foundation.h>

typedef void (^succeccBlock)(NSDictionary *responseDic);

@interface block : NSObject

- (void)success:(succeccBlock)successBlock;

@end

界面2.m

#import "block.h"

@implementation block

- (void)success:(succeccBlock)successBlock{
    NSDictionary *resultDic = @{@"key":@"123"};
    successBlock(resultDic);
}

@end

接下来就是接收数据了
界面1.m

- (void)viewDidLoad {
    [super viewDidLoad];
    
    block *block1 = [[block alloc] init];
    [block1 success:^(NSDictionary *responseDic) {
        NSString *value = responseDic[@"key"];
        NSLog(@"%@",value);
    }];
    // Do any additional setup after loading the view, typically from a nib.
}

打印结果

49148F81-8C62-4D34-B5E5-EA918E7D4E14.png