从ViewController跳转到FirstViewController, 在FirstViewController中传一个NSInteger值回来
ViewController.m
#import "ViewController.h"
#import "FirstViewController.h"
@interface
ViewController () <PassValueDelegate>
@end
@implementation ViewController
- (void)viewDidLoad {
[super
viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor
whiteColor];
_myButton = [UIButton
buttonWithType:UIButtonTypeCustom];
_myButton.frame =
CGRectMake(20,
20, 100,
100);
[_myButton
setTitle:@"跳转"
forState:UIControlStateNormal];
_myButton.backgroundColor = [UIColor
redColor];
[_myButton
addTarget:self
action:@selector(clicked:)
forControlEvents:UIControlEventTouchUpInside];
[self.view
addSubview:_myButton];
}
// button点击事件 跳转到FirstViewController
- (void)clicked:(UIButton *)button
{
FirstViewController *firVC = [[FirstViewController
alloc]
init];
firVC.passDelegate =
self;
[self
presentViewController:firVC animated:YES
completion:nil];
}
- (void)setValue:(NSInteger )value
{
NSLog(@"value ===== %ld", (long)value);
}
@end
FirstViewController.h
// 签协议 以及方法（名子自己起，类型为要传的值的类型）
@protocol PassValueDelegate <NSObject>
- (void)setValue:(NSInteger)value;
@end
@interface FirstViewController :
UIViewController
// 签代理 属性
@property(nonatomic, assign)
id<PassValueDelegate> passDelegate;
@property(nonatomic, assign)
NSInteger number;
@end
FirstViewController.m
#import "FirstViewController.h"
@interface
FirstViewController ()
@end
@implementation FirstViewController
- (void)viewDidLoad {
[super
viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor
greenColor];
_myButton = [UIButton
buttonWithType:UIButtonTypeCustom];
_myButton.frame =
CGRectMake(20,
20, 100,
100);
[_myButton
addTarget:self
action:@selector(clicked:)
forControlEvents:UIControlEventTouchUpInside];
[self.view
addSubview:_myButton];
_number = 1000;
}
//代理遵从协议的方法
- (void)clicked:(UIButton *)button
{
[self.passDelegate
setValue:_number];
[self
dismissViewControllerAnimated:YES
completion:nil];
}