property、initializer 这两种适合VCA传值给VCB，在VCB做界面展示
- property传值
#import "xxxxxxxA.h"
//property button
UIButton *propertyButton = [[UIButton alloc] init];
[propertyButton setBackgroundColor:[UIColor orangeColor]];
[propertyButton setTitle:@"next VC (property)" forState:UIControlStateNormal];
[propertyButton addTarget:self action:@selector(propertyButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
propertyButton.frame = CGRectMake(50, 50, 200, 30);
[view addSubview:propertyButton];
- (void)propertyButtonClicked:(id)sender
{
TestViewControllerB *viewControllerB = [[TestViewControllerB alloc] init];
viewControllerB.property1 = @"via Property value";
[self.navigationController pushViewController:viewControllerB animated:YES];
}
#import "xxxxxB.h"
@property (nonatomic, retain) NSString *property1;
//label
UILabel *label = [[UILabel alloc] init];
[label setBackgroundColor:[UIColor orangeColor]];
[label setTextColor:[UIColor whiteColor]];
[label setFont:[UIFont systemFontOfSize:15]];
[label setFrame:CGRectMake(50, 50, 200, 30)];
[view addSubview:label];
label.text = self.property1;//属性赋值
- initializer
#import "xxxxA.h"
//initializer button
UIButton *initializerButton = [[UIButton alloc] init];
[initializerButton setBackgroundColor:[UIColor orangeColor]];
[initializerButton setTitle:@"next VC (initializer)" forState:UIControlStateNormal];
[initializerButton addTarget:self action:@selector(initializerButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
initializerButton.frame = CGRectMake(50, CGRectGetMaxY(propertyButton.frame) + 30, 200, 30);
[view addSubview:initializerButton];
- (void)initializerButtonClicked:(id)sender
{
TestViewControllerB *viewControllerB = [[TestViewControllerB alloc] initWithProperty1:@"via Initializer value"];
[self.navigationController pushViewController:viewControllerB animated:YES];
}
#import "xxxxxB.h"
- (instancetype)initWithProperty1:(NSString *)property1Value;
- (instancetype)initWithProperty1:(NSString *)property1Value
{
self = [self init];
if (self)
{
self.property1 = property1Value;
}
return self;
}
delegate、block ，VCA到VCB，VCB回调值给VCA，适合当前页面往pop之后的页面传值
- delegate
#import "xxxxxxA.h"
@interface xxxxxxA ()
{
UILabel *_delegateLabel;
}
UIButton *delegateButton = [[UIButton alloc] init];
[delegateButton setBackgroundColor:[UIColor orangeColor]];
[delegateButton setTitle:@"next VC (delelgate)" forState:UIControlStateNormal];
[delegateButton addTarget:self action:@selector(delegateButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
delegateButton.frame = CGRectMake(50, CGRectGetMaxY(initializerButton.frame) + 30, 200, 30);
[view addSubview:delegateButton];
_delegateLabel = [[UILabel alloc] init];
[_delegateLabel setBackgroundColor:[UIColor lightGrayColor]];
[_delegateLabel setTextColor:[UIColor whiteColor]];
[_delegateLabel setFont:[UIFont systemFontOfSize:15]];
_delegateLabel.frame = CGRectMake(CGRectGetMaxX(delegateButton.frame) + 5, CGRectGetMinY(delegateButton.frame), 150, 30);
[view addSubview:_delegateLabel];
- (void)delegateButtonClicked:(id)sender
{
TestViewControllerB *viewControllerB = [[TestViewControllerB alloc] init];
viewControllerB.delegate = self;
[self.navigationController pushViewController:viewControllerB animated:YES];
}
#pragma mark - delegate
- (void)testViewControllerB:(TestViewControllerB *)testViewControllerB sendDataBack:(NSString *)data
{
_delegateLabel.text = data;
}
#import"xxxxB.h"
@protocol TestViewControllerBDelegate
- (void)testViewControllerB:(TestViewControllerB *)testViewControllerB sendDataBack:(NSString *)data;
@end
@interface xxxxB : UIViewController
@property (nonatomic, weak) id delegate;
@end
if (_delegate)
{
UIButton *notifyDelegateButton = [[UIButton alloc] init];
[notifyDelegateButton setBackgroundColor:[UIColor orangeColor]];
[notifyDelegateButton setTitle:@"notify delegate" forState:UIControlStateNormal];
[notifyDelegateButton addTarget:self action:@selector(notifyDelegateButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
notifyDelegateButton.frame = CGRectMake(50, 50, 200, 30);
[view addSubview:notifyDelegateButton];
}
#pragma mark - button
- (void)notifyDelegateButtonClicked:(id)sender
{
if ([_delegate respondsToSelector:@selector(testViewControllerB:sendDataBack:)])
{
[_delegate testViewControllerB:self sendDataBack:@"notify delegate"];
}
[self.navigationController popViewControllerAnimated:YES];
}
- block
#import "xxxxxA.h"
@interface TestViewControllerA ()
{
UILabel *_blockLabel;
}
//block button
UIButton *blockButton = [[UIButton alloc] init];
[blockButton setBackgroundColor:[UIColor orangeColor]];
[blockButton setTitle:@"next VC (block)" forState:UIControlStateNormal];
[blockButton addTarget:self action:@selector(blockButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
blockButton.frame = CGRectMake(50, CGRectGetMaxY(delegateButton.frame) + 30, 200, 30);
[view addSubview:blockButton];
_blockLabel = [[UILabel alloc] init];
[_blockLabel setBackgroundColor:[UIColor lightGrayColor]];
[_blockLabel setTextColor:[UIColor whiteColor]];
[_blockLabel setFont:[UIFont systemFontOfSize:15]];
_blockLabel.frame = CGRectMake(CGRectGetMaxX(blockButton.frame) + 5, CGRectGetMinY(blockButton.frame), 150, 30);
[view addSubview:_blockLabel];
- (void)blockButtonClicked:(id)sender
{
TestViewControllerB *viewControllerB = [[TestViewControllerB alloc] initWithDataBlock:^(NSString *data) {
_blockLabel.text = data;
}];
[self.navigationController pushViewController:viewControllerB animated:YES];
}
#import "xxxxxxB.h"
typedef void(^DataBlock) (NSString * data);
- (instancetype)initWithDataBlock:(DataBlock)dataBlock;
#import"xxxxxxB.m"
@interface xxxxxxB ()
{
DataBlock _dataBlock;
}
- (instancetype)initWithDataBlock:(DataBlock)dataBlock
{
self = [self init];
if (self) {
_dataBlock = [dataBlock copy];
}
return self;
}
if (_dataBlock)
{
UIButton *blockButton = [[UIButton alloc] init];
[blockButton setBackgroundColor:[UIColor orangeColor]];
[blockButton setTitle:@"notify block" forState:UIControlStateNormal];
[blockButton addTarget:self action:@selector(blockButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
blockButton.frame = CGRectMake(50, 50, 200, 30);
[view addSubview:blockButton];
}
- (void)blockButtonClicked:(id)sender
{
if (_dataBlock) {
_dataBlock(@"notify Block");
}
[self.navigationController popViewControllerAnimated:YES];
}
notification 一对多的传值，不用关心逻辑
#import "xxxxA.h"
@interface TestViewControllerA ()
UILabel *_notificationLabel;
}
//notification button
UIButton *notificationButton = [[UIButton alloc] init];
[notificationButton setBackgroundColor:[UIColor orangeColor]];
[notificationButton setTitle:@"next VC (notification)" forState:UIControlStateNormal];
[notificationButton addTarget:self action:@selector(notificationButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
notificationButton.frame = CGRectMake(50, CGRectGetMaxY(blockButton.frame) + 30, 200, 30);
[view addSubview:notificationButton];
_notificationLabel = [[UILabel alloc] init];
[_notificationLabel setBackgroundColor:[UIColor lightGrayColor]];
[_notificationLabel setTextColor:[UIColor whiteColor]];
[_notificationLabel setFont:[UIFont systemFontOfSize:15]];
_notificationLabel.frame = CGRectMake(CGRectGetMaxX(notificationButton.frame) + 5, CGRectGetMinY(notificationButton.frame), 150, 30);
[view addSubview:_notificationLabel];
- (void)notificationButtonClicked:(id)sender
{
TestViewControllerB *viewControllerB = [[TestViewControllerB alloc] initWithNotification];
[self.navigationController pushViewController:viewControllerB animated:YES];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notificationReceived:) name:TestViewControllerBNotification object:nil];
}
#pragma mark - notification
- (void)notificationReceived:(NSNotification *)notification
{
NSDictionary *userInfo = notification.userInfo;
if ([userInfo isKindOfClass:[NSDictionary class]])
{
_notificationLabel.text = userInfo[@"data"];
}
}
#import "xxxxxxxB.h"
FOUNDATION_EXTERN NSString *const TestViewControllerBNotification;
- (instancetype)initWithNotification;
#import "xxxxxB.m"
if (_useNotification)
{
UIButton *notificationButton = [[UIButton alloc] init];
[notificationButton setBackgroundColor:[UIColor orangeColor]];
[notificationButton setTitle:@"notify notification" forState:UIControlStateNormal];
[notificationButton addTarget:self action:@selector(notificationButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
notificationButton.frame = CGRectMake(50, 50, 200, 30);
[view addSubview:notificationButton];
}
- (void)notificationButtonClicked:(id)sender
{
[[NSNotificationCenter defaultCenter] postNotificationName:TestViewControllerBNotification object:nil userInfo:@{@"data" : @"notification data"}];
[self.navigationController popViewControllerAnimated:YES];
}
mediator 两个VC间相互传值，这里需要加一个管理值得类
#import "AppDelegate.h"
#import "xxxxxxxA.h"
@interface xxxxxxxA ()
{
UILabel *_mediatorLabel;
}
//mediator button
UIButton *mediatorButton = [[UIButton alloc] init];
[mediatorButton setBackgroundColor:[UIColor orangeColor]];
[mediatorButton setTitle:@"next VC (mediator)" forState:UIControlStateNormal];
[mediatorButton addTarget:self action:@selector(mediatorButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
mediatorButton.frame = CGRectMake(50, CGRectGetMaxY(notificationButton.frame) + 30, 200, 30);
[view addSubview:mediatorButton];
_mediatorLabel = [[UILabel alloc] init];
[_mediatorLabel setBackgroundColor:[UIColor lightGrayColor]];
[_mediatorLabel setTextColor:[UIColor whiteColor]];
[_mediatorLabel setFont:[UIFont systemFontOfSize:15]];
_mediatorLabel.frame = CGRectMake(CGRectGetMaxX(mediatorButton.frame) + 5, CGRectGetMinY(mediatorButton.frame), 150, 30);
[view addSubview:_mediatorLabel];
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
if (_mediatorLabel) {
_mediatorLabel.text = ((AppDelegate *)[UIApplication sharedApplication].delegate).sharedString;
}
}
- (void)mediatorButtonClicked:(id)sender
{
TestViewControllerB *viewControllerB = [[TestViewControllerB alloc] initWithMediator];
[self.navigationController pushViewController:viewControllerB animated:YES];
}
#import "AppDelegate.h"
#import "xxxxB.h"
- (instancetype)initWithMediator;
@interface xxxxB ()
{
BOOL _useMediator; //demo
}
- (instancetype)initWithMediator
{
self = [self init];
if (self) {
_useMediator = YES;
}
return self;
}
if (_useMediator)
{
UIButton *mediatorButton = [[UIButton alloc] init];
[mediatorButton setBackgroundColor:[UIColor orangeColor]];
[mediatorButton setTitle:@"notify mediator" forState:UIControlStateNormal];
[mediatorButton addTarget:self action:@selector(mediatorButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
mediatorButton.frame = CGRectMake(50, 50, 200, 30);
[view addSubview:mediatorButton];
}
- (void)mediatorButtonClicked:(id)sender
{
((AppDelegate *)[UIApplication sharedApplication].delegate).sharedString = @"shared mediator";
[self.navigationController popViewControllerAnimated:YES];
}
#import "AppDelegate.h"
@interface AppDelegate : UIResponder
@property (nonatomic, retain) NSString *sharedString;
@end