1、使用SharedApplication,定义一个变量来传递.
2、使用文件,或者NSUserdefault来传递
3、通过一个单例的class来传递
4、通过Delegate来传递。
IOS开发使用委托delegate在不同窗口之间传递数据是本文要介绍的内容,主要是来讲解如何使用委托delegate在不同窗口之间传递数据,具体内容来看详细内容。在IOS开发里两个UIView窗口之间传递参数方法有很多,比如
前面3种方法,暂且不说,这次主要学习如何使用通过Delegate的方法来在不同的UIView里传递数据
比如: 在窗口1中打开窗口2,然后在窗口2中填入一个数字,这个数字又回传给窗口1。
窗口1
窗口2
窗口2的结果传递给窗口1
1、首先定义个一委托UIViewPassValueDelegate用来传递值
@protocol UIViewPassValueDelegate
- (void)passValue:(NSString *)value;
@end
这个protocol 就是用来传递值
2、在窗口1的头文件里,声明delegate
#import <UIKit/UIKit.h>
#import "UIViewPassValueDelegate.h"
@interface DelegateSampleViewController : UIViewController <UIViewPassValueDelegate>
{
UITextField *_value;
}
@property(nonatomic, retain) IBOutlet UITextField *value;
- (IBAction)buttonClick:(id)sender;
@end
并实现这个委托
- (void)passValue:(NSString *)value
{
self.value.text = value;
NSLog(@"the get value is %@", value);
}
button的Click方法,打开窗口2,并将窗口2的delegate实现方法指向窗口1。
- (IBAction)buttonClick:(id)sender
{
ValueInputView *valueView = [[ValueInputView alloc] initWithNibName:@"ValueInputView" bundle:[NSBundle mainBundle]];
valueView.delegate = self;
[self setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
[self presentModalViewController:valueView animated:YES];
}
第二个窗口的实现
.h 头文件
#import <UIKit/UIKit.h>
#import "UIViewPassValueDelegate.h" @interface ValueInputView : UIViewController { NSObject<UIViewPassValueDelegate> * delegate;
UITextField *_value;
}
@property(nonatomic, retain)IBOutlet UITextField *value;
@property(nonatomic, retain) NSObject<UIViewPassValueDelegate> * delegate;
- (IBAction)buttonClick:(id)sender;
@end
.m实现文件
#import "ValueInputView.h"
@implementation ValueInputView
@synthesize delegate;
@synthesize value = _value;
- (void)dealloc {
[self.value release];
[super dealloc];
} - (IBAction)buttonClick:(id)sender
{
[delegate passValue:self.value.text];
NSLog(@"self.value.text is%@", self.value.text);
[self dismissModalViewControllerAnimated:YES]; }
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning]; // Release any cached data, images, etc. that aren't in use.
} - (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
} @end