iOS中使用block傳值

來源:互聯網
上載者:User

標籤:style   blog   class   code   java   tar   

轉自:http://blog.sina.com.cn/s/blog_60b45f230100yiaf.html

用此方法傳值可以替代委託了。具體例子:

MainView.h
#import <UIKit/UIKit.h>@interface MainView : UIViewController{    IBOutlet UIButton* btn;    IBOutlet UILabel* labShow;}-(IBAction)push:(id)sender;@end

 

MainView.m

#import "MainView.h"#import "SecondView.h"@implementation MainView- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {    }    return self;}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];}#pragma mark - View lifecycle- (void)viewDidLoad{    [super viewDidLoad];}-(IBAction)push:(id)sender{    SecondView *s = [[SecondView alloc] initwithBlock:^(NSString *str){        NSLog(@"%@",str);        labShow.text = str;    }];    [self.navigationController pushViewController:s  animated:YES];    [s release];}- (void)viewDidUnload{    [super viewDidUnload];}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation == UIInterfaceOrientationPortrait);}@end

 

SecondView.h
#import <UIKit/UIKit.h>typedef void (^MyBlock)(NSString *);@interface SecondView : UIViewController{    IBOutlet UITextField* txtView;    MyBlock my;}-(IBAction)back:(id)sender;-(id)initwithBlock:(MyBlock)str;@end

 

SecondView.m
#import "SecondView.h"@implementation SecondView-(id)initwithBlock:(MyBlock)str{    self = [super init];    if(self)    {           my = str;    }    return self;}-(IBAction)back:(id)sender{    NSString* s = txtView.text;    if(my)    {        my(s);    }    [self.navigationController popViewControllerAnimated:YES];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];}-(void)dealloc{    Block_release(my);    [super dealloc];    }#pragma mark - View lifecycle- (void)viewDidLoad{    [super viewDidLoad];}- (void)viewDidUnload{    [super viewDidUnload];}- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return (interfaceOrientation == UIInterfaceOrientationPortrait);}@end

 

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