页面之间传值，常见的几种方式。

ViewController页面传到TwoViewController页面name的值：两个页面都拥有一个字符串对象，跳转之前，把对象传过去。

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (nonatomic,copy)NSString *name;

@end

- (void)viewDidLoad {

[super viewDidLoad];

self.name = @"ranki";

TwoViewController *two = [[TwoViewController alloc]init];

two.name = self.name;

//    [self.navigationController pushViewController:two animated:YES];

[self presentModalViewController:two animated:YES];

}

@interface TwoViewController : UIViewController

@property (nonatomic,copy)NSString *name;

@end

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

NSLog(@"~~~~~~~~~~~~~~~~~~~~~~~%@",self.name);

}