大纲
一、使用属性在窗体中的传值
1.正向传值:将值从vc1传至vc2
项目:AttributeTransferValue0316
方法:使用属性
步骤:
1.在vc2中设置属性(拿到vc1中取值,再传回vc2。谁需要,谁设属性。需要什么类型,就要声明什么类型的属性)
2.给属性赋值
3.使用属性保存的值
2.反向传值:将值从vc2传至vc1
项目:TransferBack0316
方法1(不建议使用):使用属性传值
原因:通过索引获取vc数组中的vc1时,容易出错。
二、自定义AlertView
注意:
①全局变量,本类中使用;属性,本类和其他类都可使用。
②若父视图的alpha不为1,无论子视图是否设置自己的alpha,子视图alpha=父视图的alpha。
1.1 声明属性、初始化方法
1.2 实现init和show方法
2.1设置属性(水桶)
2.2为属性赋值(装水)
2.3 获取属性(水桶)
正文
一、使用属性在窗体中的传值
1.正向传值:将值从vc1传至vc2
项目:AttributeTransferValue0316
方法:使用属性
步骤:
1.在vc2中设置属性(拿到vc1中取值,再传回vc2。谁需要,谁设属性。需要什么类型,就要声明什么类型的属性)
2.给属性赋值
3.使用属性保存的值
源码:
文件1:AppDelegate.m
ViewController1 *vc1 = [[ViewController1 alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vc1];
self.window.rootViewController = nav;
文件2:ViewController1.m
@interface ViewController1 ()
{
__weak IBOutlet UITextField *_textFieldVc1;
}
@end
@implementation ViewController1
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"vc1";
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
//vc1 --> vc2
- (IBAction)nextClick:(UIButton *)sender
{
ViewController2 *vc2 = [[ViewController2 alloc]init];
//传值第二步:给属性赋值
//情况1:使用字符串
//在创建对象之后,在push之前
vc2.strVc2 = _textFieldVc1.text;
[self.navigationController pushViewController:vc2 animated:YES];
}
文件3:ViewController2.h
#import
@interface ViewController2 : UIViewController
//哪个类需要取值,就在哪个类中设置属性,用来保存值。
//nonatomic:非原子性的
//copy:与内存管理有关
@property (nonatomic,copy)NSString *strVc2;
@property (nonatomic,retain)NSArray *arrStr;
//描述属性的关键字(与内存管理有关)
//字符串:copy
//基本数据类型,结构体:assign
//其他类型:retain
@end
文件4:ViewController2.m
@interface ViewController2 ()
{
__weak IBOutlet UILabel *_labVc2;
}
@end
@implementation ViewController2
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"vc2";
//传值第三步:使用属性保存的值
//情况1:使用字符串
_labVc2.text = self.strVc2;
}
文件5:ViewController1.xib
文件6:ViewController2.xib
2.反向传值:将值从vc2传至vc1
项目:TransferBack0316
方法1(不建议使用):使用属性传值
原因:通过索引获取vc数组中的vc1时,容易出错。
NSArray *vcArr = [self.navigationController viewControllers];
ViewController1 *vc1 = [vcArr objectAtIndex:0];
源码:
文件1:AppDelegate.m
ViewController1 *vc1 = [[ViewController1 alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:vc1];
self.window.rootViewController = nav;
文件2:ViewController1.h
@interface ViewController1 : UIViewController
{
__weak IBOutlet UILabel *_label;
}
@property (nonatomic,copy)NSString *str;
@end
文件3:ViewController1.m
//将要显示
- (void)viewWillAppear:(BOOL)animated
{
_label.text = self.str;
}
- (IBAction)nextClick:(id)sender
{
ViewController2 *vc2 = [[ViewController2 alloc]init];
[self.navigationController pushViewController:vc2 animated:YES];
}
文件4:ViewController2.h
@interface ViewController2 : UIViewController
{
__weak IBOutlet UITextField *_pwTF;
}
@end
文件5:ViewController2.m
//vc2-->vc1
- (IBAction)backClick:(id)sender
{
NSArray *vcArr = [self.navigationController viewControllers];
ViewController1 *vc1 = [vcArr objectAtIndex:0];
vc1.str = _pwTF.text;
[self.navigationController popToRootViewControllerAnimated:YES];
}
文件6:ViewController1.xib
文件7:ViewController2.xib
二、自定义AlertView
注意:
①全局变量,本类中使用;属性,本类和其他类都可使用。
②若父视图的alpha不为1,无论子视图是否设置自己的alpha,子视图alpha=父视图的alpha。
1.1 声明属性、初始化方法
文件:MyAlertView.h
//容器,水桶
@property (nonatomic,retain)ViewController *vc;
//自定义初始化方法
- (id)initWithTitle:(NSString *)title withMessage:(NSString *)message cancleBtnTitle:(NSString *)cancleBtnTitle otherBtnTitle:(NSString *)otherBtnTitle;
//展示
- (void)showView;
1.2 实现init和show方法
文件:MyAlertView.m
- (id)initWithTitle:(NSString *)title withMessage:(NSString *)message cancleBtnTitle:(NSString *)cancleBtnTitle otherBtnTitle:(NSString *)otherBtnTitle
{
self = [super init];
if (self)
{
//1.设置位置大小
self.frame = CGRectMake(0, 0, WIDTH, HEIGHT);
//不可直接设置self的透明度,否则会影响self上的子控件的透明度
// self.alpha = 0.5;
//2.1 半透明的view
UIView *gray = [[UIView alloc]initWithFrame:self.frame];
gray.backgroundColor = [UIColor grayColor];
gray.alpha = 0.5;
[self addSubview:gray];
//3.添加view
UIView *whiteView = [[UIView alloc]initWithFrame:CGRectMake(30, HEIGHT/3.0, WIDTH-60, HEIGHT/3.0)];
whiteView.backgroundColor = [UIColor whiteColor];
//圆角
whiteView.layer.cornerRadius = 20;
whiteView.clipsToBounds = YES;
[self addSubview:whiteView];
//3.1 标题
UILabel *titleLab = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, WHITEVIEW_WIDTH, WHITEVIEW_HEIGHT/4.0)];
titleLab.text = title;
titleLab.textAlignment = NSTextAlignmentCenter;
[whiteView addSubview:titleLab];
//3.2 提示信息
UILabel *messageLab = [[UILabel alloc]initWithFrame:CGRectMake(0, WHITEVIEW_HEIGHT/4.0, WHITEVIEW_WIDTH, WHITEVIEW_HEIGHT/4.0)];
messageLab.text = message;
messageLab.textAlignment = NSTextAlignmentCenter;
[whiteView addSubview:messageLab];
//3.3 取消按钮
UIButton *cancleBtn = [UIButton buttonWithType:UIButtonTypeCustom];
cancleBtn.frame = CGRectMake(0, WHITEVIEW_HEIGHT/2.0, WHITEVIEW_WIDTH/2.0, WHITEVIEW_HEIGHT/2.0);
[cancleBtn setTitle:cancleBtnTitle forState:UIControlStateNormal];
[cancleBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
cancleBtn.tag = 1;
[cancleBtn addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[whiteView addSubview:cancleBtn];
//3.3 确定按钮
UIButton *otherBtn = [UIButton buttonWithType:UIButtonTypeCustom];
otherBtn.frame = CGRectMake(WHITEVIEW_WIDTH/2.0, WHITEVIEW_HEIGHT/2.0, WHITEVIEW_WIDTH/2.0, WHITEVIEW_HEIGHT/2.0);
[otherBtn setTitle:otherBtnTitle forState:UIControlStateNormal];
[otherBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
otherBtn.tag = 2;
[otherBtn addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[whiteView addSubview:otherBtn];
}
return self;
}
//按钮点击事件
- (void)buttonClick:(UIButton *)sender
{
//如果是确定
if (sender.tag == 2)
{
//改变颜色
self.vc.view.backgroundColor = [UIColor redColor];
}
NSLog(@"%@",sender);
[self removeFromSuperview];
}
//展示
- (void)showView
{
UIWindow *window = [UIApplication sharedApplication].delegate.window;
[window addSubview:self];
}
2.1设置属性(水桶)
文件:MyAlertView.h
@property (nonatomic,retain)ViewController *vc;
2.2为属性赋值(装水)
文件:ViewController.m
- (IBAction)deleteClick:(id)sender
{
MyAlertView *myAlertView = [[MyAlertView alloc]initWithTitle:@"ChangeColor" withMessage:@"是否改变颜色" cancleBtnTitle:@"取消" otherBtnTitle:@"确定"];
//将本类对象self传给myAlertView.vc
myAlertView.vc = self;
[myAlertView showView];
}
2.3 获取属性(水桶)
文件:MyAlertView.m
//按钮点击事件
- (void)buttonClick:(UIButton *)sender
{
//如果是确定
if (sender.tag == 2)
{
//改变颜色
self.vc.view.backgroundColor = [UIColor redColor];
}
NSLog(@"%@",sender);
[self removeFromSuperview];
}