1、iOS传值的方法－属性正向传值

        用属性进行传值，将A界面的值传递到B界面。在B类中定义一个变量，然后在A类中跳转到B类中的地方，对需要传递的变量进行赋值。

1、A类中的代码如下：

#import "FirstViewController.h"
#import "SecondViewController.h"

@interface FirstViewController ()

@property (retain, nonatomic) UITextField *textField;

@end

@implementation FirstViewController
@synthesize textField;

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor whiteColor];
self.title = @"属性正向传值";

textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 120, self.view.frame.size.width-20, 40)];
textField.placeholder = @"请输入一个值";
textField.borderStyle = UITextBorderStyleRoundedRect;
[self.view addSubview:textField];

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(10, 200, self.view.frame.size.width-20, 35)];
btn.backgroundColor = [UIColor grayColor];
[btn setTitle:@"确定" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)btnClick:(id)sender {

SecondViewController *second = [[SecondViewController alloc] init];
second.string = textField.text; //对需要传递的变量进行复制
[self.navigationController pushViewController:second animated:YES];

}

@end

2、B类中中的代码如下

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@property (retain, nonatomic) NSString *string; //定义传值变量的属性

@end

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController
@synthesize string;

- (void)viewDidLoad {
[super viewDidLoad];

self.view.backgroundColor = [UIColor whiteColor];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, self.view.frame.size.width-20, 30)];
NSString *str = [NSString stringWithFormat:@"%@:%@",@"你传的值为",string];
label.text = str;
[self.view addSubview:label];
}

      


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