初始UI(UILabel、UIButton、UITextField)

UI指的是UserInterFace（用户界面）

UILabel

    //获取屏幕的尺寸    UIScreen *screen = [UIScreen mainScreen];    self.window = [[UIWindow alloc]initWithFrame:screen.bounds];    self.window.backgroundColor = [UIColor redColor];    [self.window makeKeyAndVisible];//    self.window.rootViewController    UILabel *label = [[UILabel alloc]initWithFrame:CGRectZero];    label.text = @"You have to have the courage to examine who you really are, to come to terms with the dark corner of your own soul.";    label.textColor = [UIColor whiteColor];    //字体大小//    label.font = [UIFont fontWithName:@"Telugu Sangam MN" size:28];//    label.font = [UIFont boldSystemFontOfSize:28];//加粗    label.font = [UIFont systemFontOfSize:20];    NSArray *array = [UIFont familyNames];    NSLog(@"%@",array);    //对齐方式    label.textAlignment = NSTextAlignmentCenter;    label.backgroundColor = [UIColor blackColor];    //文本换行    label.numberOfLines = 0;//0代表不限制label行数    //省略号放置地方，并没什么卵用    label.lineBreakMode = NSLineBreakByTruncatingHead;//省略号放置中间    [self.window addSubview:label];    //根据文本内容的内容的长度确定label的宽度    UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectZero];    NSString *text = @"黑凤梨";    label1.text = text;    label1.font = [UIFont systemFontOfSize:28];    CGSize size = [text sizeWithAttributes:@{NSFontAttributeName:label1.font}];    label1.frame = CGRectMake(100, 300, size.width, size.height);    label1.backgroundColor = [UIColor blackColor];    label1.textColor = [UIColor whiteColor];    [self.window addSubview:label1];    CGRect rect = [label.text boundingRectWithSize:CGSizeMake(screen.bounds.size.width, 300) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:label.font} context:nil];    label.frame = CGRectMake(0, 20, rect.size.width, rect.size.height);

UIBotton

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];    self.window.backgroundColor = [UIColor redColor];    [self.window makeKeyAndVisible];    //凡是继承于UIControl的空间都具有响应事件的能力    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame = CGRectMake(10, 60, 60, 60);    [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];    [button setTitle:@"我是按钮" forState:UIControlStateNormal];    [button setTitle:@"高亮状态" forState:UIControlStateHighlighted];    [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];    button.backgroundColor = [UIColor blackColor];    [self.window addSubview:button];    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeSystem];    button1.frame = CGRectMake(10, 130, 60, 60);    [self.window addSubview:button1];    button1.backgroundColor = [UIColor blackColor];    [button1 addTarget:self action:@selector(button1Action:) forControlEvents:UIControlEventTouchUpInside];    [button1 setTitle:@"正常状态" forState:UIControlStateNormal];    [button1 setTitle:@"选中状态" forState:UIControlStateSelected];    [button1 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];    [button1 setTitleColor:[UIColor whiteColor] forState:UIControlStateSelected];    UIButton *button2 = [UIButton buttonWithType:UIButtonTypeSystem];    button2.frame = CGRectMake(10, 200, 60, 60);    [self.window addSubview:button2];    button2.backgroundColor = [UIColor blackColor];    [button2 addTarget:self action:@selector(button2Action:) forControlEvents:UIControlEventTouchUpInside];    [button2 setTitle:@"正常状态" forState:UIControlStateNormal];    [button2 setTitle:@"编辑状态" forState:UIControlStateDisabled];    [button2 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];    [button2 setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];    button2.enabled = NO;    //--------------------------------------------------    //自定义按钮    UIButton *cButton = [UIButton buttonWithType:UIButtonTypeCustom];    cButton.frame = CGRectMake(100, 60, 60, 60);    [cButton addTarget:self action:@selector(cButtonAction:) forControlEvents:UIControlEventTouchUpInside];    [cButton setImage:[UIImage imageNamed:@"11"] forState:UIControlStateNormal];    [cButton setImage:[UIImage imageNamed:@"123.jpg"] forState:UIControlStateHighlighted];    [self.window addSubview:cButton];    UIButton *cButton1 = [UIButton buttonWithType:UIButtonTypeCustom];    cButton1.frame = CGRectMake(100, 130, 60, 60);    [cButton1 addTarget:self action:@selector(cButton1Action:) forControlEvents:UIControlEventTouchUpInside];    [cButton1 setImage:[UIImage imageNamed:@"11"] forState:UIControlStateNormal];    [cButton1 setImage:[UIImage imageNamed:@"123.jpg"] forState:UIControlStateSelected];    [self.window addSubview:cButton1];    //------------------------------------    //长按    UIView *view = [[UIView alloc]initWithFrame:CGRectMake(40, 300, 300, 300)];    view.backgroundColor = [UIColor blackColor];    [self.window addSubview:view];    UIButton *kButton = [UIButton buttonWithType:UIButtonTypeSystem];    kButton.frame = CGRectMake(120, 135, 60, 30);    [kButton setTitle:@"按住说话" forState:UIControlStateNormal];    [kButton setTitleColor:[UIColor redColor] forState:UIControlStateNormal];    [kButton addTarget:self action:@selector(kButtonActionTouchDown:) forControlEvents:UIControlEventTouchDown];    [kButton addTarget:self action:@selector(kButtonActionTouchUpInserd:) forControlEvents:UIControlEventTouchUpInside];    [view addSubview:kButton];    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"11"]];    imageView.frame = CGRectMake(125, 55, 50, 70);    [view addSubview:imageView];    flagView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"123.jpg"]];    flagView.frame = CGRectMake(177, 55, 20, 20);    flagView.hidden = YES;    flagView.animationImages = @[[UIImage imageNamed:@"123.jpg"],[UIImage imageNamed:@"11"]];    flagView.animationDuration = 0.05;    [view addSubview:flagView];    return YES;}-(void)buttonAction:(UIButton *)sender{    NSLog(@"button响应事件");}-(void)button1Action:(UIButton *)sender{    NSLog(@"button1响应事件");    sender.selected = !sender.selected;}-(void)button2Action:(UIButton *)sender{    NSLog(@"button2响应事件");}-(void)cButtonAction:(UIButton *)sender{    NSLog(@"cButton响应事件");}-(void)cButton1Action:(UIButton *)sender{    NSLog(@"cButton1响应事件");    sender.selected = !sender.selected;}-(void)kButtonActionTouchDown:(UIButton *)sender{    NSLog(@"按下");    [flagView setHidden:NO];    [flagView startAnimating];}-(void)kButtonActionTouchUpInserd:(UIButton *)sender{    [flagView setHidden:YES];    [flagView stopAnimating];    NSLog(@"松开");}

UITextField

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];    self.window.backgroundColor = [UIColor redColor];    //UITextField文本框    textField = [[UITextField alloc]initWithFrame:CGRectMake(10, 60, 200, 30)];    [self.window addSubview:textField];    //在实际开发中不用borderStyle属性（一般）//    textField.borderStyle = UITextBorderStyleLine;    textField.background = [UIImage imageNamed:@"11"];    textField.leftView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"22"]];    textField.leftViewMode = UITextFieldViewModeAlways;    textField.clearButtonMode = UITextFieldViewModeWhileEditing;    textField.placeholder = @"请输入密码";    textField.secureTextEntry = NO;//掩码    //键盘是作为文本框的第一响应者    //让键盘自动弹出//    [textField becomeFirstResponder];    //键盘回收，即注销第一响应者 [textField resignFirstResponder];    //修改键盘样式//    textField.keyboardType = UIKeyboardTypeNumberPad;//    textField.returnKeyType = UIReturnKeySearch;    //文本框的重要属性 delegate    textField.delegate = self;    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame = CGRectMake(60, 100, 60, 44);    [button setTitle:@"登陆" forState:UIControlStateNormal];    [button addTarget:self action:@selector(loginAction:) forControlEvents:UIControlEventTouchUpInside];    [self.window addSubview:button];    [self.window makeKeyAndVisible];    return YES;}-(void)loginAction:(UIButton *)sender{    NSLog(@"登陆,文本框的内容为：%@",textField.text);    //注销第一响应者，回收键盘    [textField resignFirstResponder];}#pragma mark ----------------------------------------------//手放在文本框上就执行这个方法，如果返回NO键盘不能弹出- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{    return YES;}//用户开始编辑时候执行- (void)textFieldDidBeginEditing:(UITextField *)textField{    NSLog(@"%s",__func__);}//编辑完之后执行的方法- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{    NSLog(@"%s",__func__);    return YES;}//执行完之后的方法- (void)textFieldDidEndEditing:(UITextField *)textField{    NSLog(@"%s",__func__);}//编辑过程中- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{//    NSLog(@"%@",range);    NSLog(@"%@",string);    NSLog(@"%s",__func__);    return YES;}//按clear按钮之后执行的行为- (BOOL)textFieldShouldClear:(UITextField *)textField{    NSLog(@"%s",__func__);    return YES;}//按return之后执行- (BOOL)textFieldShouldReturn:(UITextField *)textField{    return [textField resignFirstResponder];}