VC中 自带一个view 用于铺设视图 默认颜色为透明

self.view.backgroundColor = [UIColor cyanColor];

BUTTON

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

btn.frame = CGRectMake(100, 100, 100, 100);

btn.backgroundColor = [UIColor yellowColor];

[btn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:btn];

UIImageView 

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 200, 200, 200)];

imgView.backgroundColor = [UIColor grayColor];

[self.view addSubview:imgView];

[imgView release];

添加图片

相对路径 修改之后仍然可以正常显示

绝对路径 如果文件位置修改 就找不到了

 imgView.image = [UIImage imageNamed:@"color"];

收获路径(动态变化的绝对路径)

 参数1: 文件名

 参数2: 文件后缀

NSString *path = [[NSBundle mainBundle] pathForResource:@"color" ofType:@"png"];

imgView.image = [UIImage imageWithContentsOfFile:path];

 圆角

imgView.layer.cornerRadius = imgView.frame.size.width / 2;

 根据边界把多余部分切掉

imgView.clipsToBounds = YES;

用户名

LTView *user = [[LTView alloc] initWithFrame:CGRectMake(0, 250, 375, 60)];

user.backgroundColor = [UIColor lightGrayColor];

[self.view addSubview:user];

[user release];

user.label.text = @"用户名";

页面跳转（模态）

- (void)go

{

NSLog(@"点点点");

TwoViewController *twoVC = [[TwoViewController alloc] init];

[self presentViewController:twoVC animated:YES completion:^{

}];

}

模态返回

- (void)back

{

NSLog(@"返回");

[self dismissViewControllerAnimated:YES completion:^{

}];

}

导航

导航栏设置: controller(栏)/item(栏上的元素)

导航栏显示/隐藏

self.navigationController.navigationBarHidden = NO;

或 self.navigationController.navigationBar.hidden = YES;

 栏样式

self.navigationController.navigationBar.barStyle = UIBarStyleBlack;

 半透明效果

 开始效果时 屏幕左上角为坐标原点

 关闭时 导航栏的左下角为坐标原点

self.navigationController.navigationBar.translucent = YES;

 创建view(0,0,100,100)

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];

view.backgroundColor = [UIColor greenColor];

[self.view addSubview:view];

[view release];

 栏背景颜色

self.navigationController.navigationBar.backgroundColor = [UIColor yellowColor];

 栏颜色

self.navigationController.navigationBar.barTintColor = [UIColor grayColor];

 栏标题

self.title = @"这是一个标题";

self.navigationItem.title = @"这是一个猴赛雷的标题";

分段控制器

UISegmentedControl *seg = [[[UISegmentedControl alloc] initWithItems:@[@"消息", @"电话"]] autorelease];

seg.frame = CGRectMake(0, 0, 100, 30);

栏标题视图

self.navigationItem.titleView = seg;

栏左侧按钮

self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(left:)] autorelease];

栏右侧按钮

系统按钮样式

UIBarButtonItem *b1 = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:@selector(right1)] autorelease];

自定义按钮图片

UIBarButtonItem *b2 = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"dianzan"] style:UIBarButtonItemStylePlain target:self action:@selector(right2)] autorelease];

self.navigationItem.rightBarButtonItems = @[b1, b2];

修改导航栏上内容的颜色

self.navigationController.navigationBar.tintColor = [UIColor whiteColor];

跳转页面

写一个button

UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];

btn.frame = CGRectMake(200, 200, 100, 100);

btn.backgroundColor = [UIColor yellowColor];

[self.view addSubview:btn];

调用goTwo方法

[btn addTarget:self action:@selector(goTwo) forControlEvents:UIControlEventTouchUpInside];

}

#pragma mark - 跳转页面

- (void)goTwo

{

 1.获取第二页对象

TwoViewController *twoVC = [[TwoViewController alloc] init];

2.跳转(由导航控制器 从当前push到第二页)

[self.navigationController pushViewController:twoVC animated:YES];

3.内存管理

[twoVC release];

}

页面返回

- (void)back

{

NSLog(@"返回");

 由导航控制器 控制当前VC返回上一页

[self.navigationController popViewControllerAnimated:YES];

}

页面间传值

协议4.签协议

@interface RootViewController ()<PassDelegate>

@property (nonatomic, retain) UITextField *tf1;

self.view.backgroundColor = [UIColor whiteColor];

self.title = @"首页";

self.tf1 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 40)];

_tf1.backgroundColor = [UIColor yellowColor];

[self.view addSubview:_tf1];

[_tf1 release];

UIButton *go = [UIButton buttonWithType:UIButtonTypeSystem];

go.frame = CGRectMake(100, 200, 200, 40);

[go setTitle:@"GO" forState:UIControlStateNormal];

go.backgroundColor = [UIColor redColor];

[go addTarget:self action:@selector(go) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:go];

调用的方法

- (void)go

{

TwoViewController *twoVC = [[TwoViewController alloc] init];

属性2: 在push页面之前传值(创建对象之后 push之前)

twoVC.string = self.f1.text;

协议5: 设置代理人

为了保证 设置代理人的对象和push的对象是同一个 在创建对象之后 push之前 设置delegate

twoVC.delegate = self;

[self.navigationController pushViewController:twoVC animated:YES];

[twoVC release];

}

协议6: 实现协议方法

- (void)passValue:(NSString *)string

{

把收到的string 赋值给输入框

self.tf1.text = string;

}

TwoViewController.h中

协议1: 声明协议(定义一个带参数的方法)

@protocol PassDelegate<NSObject>

@optional

@required(默认)

- (void)passValue:(NSString *)string;

@end

@interface TwoViewController : UIViewController

属性1: 在第二页声明一个属性 用来保存数据

@property (nonatomic, copy) NSString *string;

协议2: 定义代理人属性@property (nonatomic, assign) id<PassDelegate>delegate;

@end

TwoViewController.m中

@property (nonatomic, retain) UITextField *tf2;

self.view.backgroundColor = [UIColor whiteColor];

self.title = @"第二页";

self.tf2 = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 40)];

_tf2.backgroundColor = [UIColor orangeColor];

[self.view addSubview:_tf2];

[_tf2 release];

属性3: 通过属性给当前页内容赋值

self.tf2.text = self.string;

UIButton *back = [UIButton buttonWithType:UIButtonTypeSystem];

back.frame = CGRectMake(100, 200, 200, 40);

[back setTitle:@"BACK" forState:UIControlStateNormal];

back.backgroundColor = [UIColor greenColor];

[back addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:back];

}

- (void)back

{

协议3: 返回上一页之前 让代理人调用协议方法

[self.delegate passValue:self.tf2.text];

[self.navigationController popViewControllerAnimated:YES];

}