ios 屬性、通知、block、代理、單例傳值
viewcontroller.m
@interfaceViewController ()<NextViewControllerDelegate>
@property (nonatomic, strong) UILabel *label;
@property (nonatomic, strong) UIButton *button;
@property (nonatomic, strong) UILabel *back;
@end
@implementation ViewController
- (UILabel *)label {
if (_label == nil) {
_label = [[
_label.backgroundColor = [UIColororangeColor];
_label.textColor = [UIColorcyanColor];
_label.font = [UIFont systemFontOfSize:20];
_label.text =@"穿穿穿穿";
}
return_label;
}
- (UIButton *)button {
if (_button == nil) {
_button = [[UIButton
_button.backgroundColor = [UIColorpurpleColor];
[_buttonsetTitle:@"NEXT"forState:UIControlStateNormal];
[_buttonsetTitleColor:[UIColorwhiteColor] forState:UIControlStateNormal];
[_buttonaddTarget:selfaction:@selector(button:) forControlEvents:
}
return_button;
}
- (UILabel *)back {
if (_back == nil) {
_back = [[UILabelalloc] initWithFrame:CGRectMake(100, 300, 200, 40)];
_back.backgroundColor = [UIColorcyanColor];
_back.textColor = [UIColorwhiteColor];
}
return_back;
}
- (void)button:(UIButton *)sender {
NextViewController *next = [[NextViewControlleralloc] init];
//一 、1.屬性傳值，將label的值傳過去,正向傳值
next.strValue = self.label.text;
//二、單例傳值，可正、反向傳值、跨頁面傳值
[DefaultSingleshareSingle].str = self.label.text;
//三、4、籤代理
next.delegate = self;
//四、block接收block回撥
next.block = ^(NSString *str) {
NSLog(@"block返回的值");
};
//五、監聽
[[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(notice:) name:@"noticeName"object:nil];
;
[selfpresentViewController:next animated:YEScompletion:nil];
}
- (void)notice:(NSNotification *)notice {
NSLog(@"接收通知的值==%@", notice.userInfo[@"key"]);
}
//三、5、實現協議方法
- (void)passValue:(NSString *)str {
NSLog(@"代理");
}
- (void)viewDidLoad {
[superviewDidLoad];
[self.view addSubview:self.label];
[self.view addSubview:self.button];
//反向傳值接收顯示
[self.view addSubview:self.back];
NSLog(@"sfsdfs");
// Do any additional setup after loading the view, typically from a nib.
}
======================================DefaultSingle.h
@interface DefaultSingle : NSObject
@property (nonatomic, copy) NSString *str;
+ (instancetype)shareSingle;
@end
DefaultSingle.m
@implementation DefaultSingle
//二、通過類方法保證類中只有一個物件
+ (instancetype)shareSingle {
static DefaultSingle *single = nil;
if (single == nil) {
single = [[DefaultSingle alloc] init];
}
return single;
}
@end
====================================
NextViewController.h
#import <UIKit/UIKit.h>
//三、1、宣告協議方法
@protocol NextViewControllerDelegate <NSObject>
- (void)passValue:(NSString *)str;
@end
@interface NextViewController : UIViewController
//三、2、協議方法介面，外部可以拿到
@property (nonatomic, strong)id<NextViewControllerDelegate>delegate;
//block反向傳值
@property (copy) void(^block)(NSString *);
@property (nonatomic, copy) NSString *strValue;//一、2.用來承接傳過來的值
@end
NextViewController.m
#import "NextViewController.h"
#import "DefaultSingle.h"
@interfaceNextViewController ()
@property (nonatomic, strong) UITextField *textField;
@property (nonatomic, strong) UIButton *btn;
@end
@implementation NextViewController
- (UITextField *)textField {
if (_textField == nil) {
_textField = [[UITextFieldalloc] initWithFrame:CGRectMake(100, 100, 200, 40)];
_textField.backgroundColor = [UIColorpurpleColor];
//_textField.textColor = [UIColor yellowColor];
_textField.borderStyle = UITextBorderStyleLine;
//一、3.屬性傳值顯示
_textField.text = self.strValue;
}
return_textField;
}
- (UIButton *)btn {
if (_btn == nil) {
_btn = [[UIButtonalloc] initWithFrame:CGRectMake(100, 200, 200, 40)];
_btn.backgroundColor = [UIColorgreenColor];
[_btnsetTitle:@"返回"forState:UIControlStateNormal];
[_btnsetTitleColor:[UIColorredColor] forState:UIControlStateNormal];
[_btnaddTarget:selfaction:@selector(btn:) forControlEvents:UIControlEventTouchUpInside];
_btn.titleLabel.font = [UIFontsystemFontOfSize:20];
}
return_btn;
}
- (void)btn:(UIButton *)sender {
//三、3、讓代理實現協議方法
[self.delegate passValue:@"代理傳值"];
//二、單例傳值接收
_textField.text = [DefaultSingleshareSingle].str;
//四、block傳值
self.block(@"block傳值");
//五、傳送通知
[[NSNotificationCenterdefaultCenter] postNotificationName:@"noticeName"object:niluserInfo:@{@"key":@"通知傳值"}];
[selfdismissViewControllerAnimated:YEScompletion:nil];
}
- (void)viewDidLoad {
[superviewDidLoad];
self.view.backgroundColor = [UIColorwhiteColor];
[self.view addSubview:self.textField];
[self.view addSubview:self.btn];
// Do any additional setup after loading the view.
}