标签:uilabel 控件 delegate uicontroller
// Created By 郭仔 2015年04月14日21:34:01
一.自定义视图:
根据需求的不同,?自定义视图继承的类也有所不同。?一般?自定义的
视图会继承于UIView。以下是?自定义视图的要点:
1、创建?一个UIView?子类
2、在类的初始化?方法中添加?子视图
3、类的.h?文件提供?一些接?口(?方法),便于外界操作?子视图
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这里以label-textfield自定义视图为例:
把Label和Textfield封装到LTView中,在?一定程度上简化了我们的代 码。
往往我们需要对LTView中的Label或者Textfield进?行?一定的控制,?比 如:设置Label的text,获取Textfield的text,给Textfield指定 delegate,设置textColor等。
为了?方便外界操作Label和Textfield,因此我们要为外界提供?一些方法。
代码实现:
@interface LTView : UIView @property(nonatomic,retain)UILabel * lable; @property(nonatomic,retain)UITextField * textField; - (instancetype) initWithFrame:(CGRect)frame andLabelText:(NSString *)labelText andPlaceholder:(NSString *)placeholder; @end
// 指定义视图,重写init - (id)init { self = [super init]; if (self) { // self = [self initWithFrame:CGRectZero]; } return self; } - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { UILabel * lable = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, frame.size.width/3, frame.size.height)]; lable.backgroundColor = [UIColor orangeColor]; [self addSubview:lable]; // 把创建的lable赋值为_lable self.lable = lable; [lable release]; // ========================= UITextField * textField = [[UITextField alloc]initWithFrame:CGRectMake(frame.size.width/3, 0, frame.size.width*2/3, frame.size.height)]; textField.backgroundColor = [UIColor yellowColor]; self.textField = textField; [self addSubview:textField]; [textField release]; } return self; } - (void)dealloc { [_lable release]; [_textField release]; [super dealloc]; } - (instancetype)initWithFrame:(CGRect)frame andLabelText:(NSString *)labelText andPlaceholder:(NSString *)placeholder { self = [self initWithFrame:frame]; if (self) { self.lable.text = labelText; self.lable.font = [UIFont systemFontOfSize:15]; self.textField.placeholder = placeholder; } return self; } - (void)setFrame:(CGRect)frame { [super setFrame:frame]; self.lable.frame = CGRectMake(0, 0, frame.size.width/3, frame.size.height); self.textField.frame = CGRectMake(frame.size.width/3, 0, frame.size.width*2/3, frame.size.height); }LoginView视图调用该自定义视图:
CGRect newFrame = CGRectMake(0, 0, 320, 480); self = [super initWithFrame:newFrame]; if (self) { LTView * ltView = [[LTView alloc]initWithFrame:CGRectMake(50, 50, 200, 50) andLabelText:@"用户名" andPlaceholder:@"请输入用户名"]; [self addSubview:ltView]; // delegate ltView.textField.delegate = self; ltView.tag = 100; [ltView release]; // ============ LTView * ltView2 = [[LTView alloc]initWithFrame:CGRectMake(50, 140, 200, 50) andLabelText:@"密码" andPlaceholder:@"请输入密码"]; ltView2.textField.secureTextEntry = YES; // ltView2.textField.delegate = self; [self addSubview:ltView2]; // ltView2.tag = 200; [ltView2 release]; // ============ UIButton * loginBtn = [UIButton buttonWithType:UIButtonTypeCustom]; loginBtn.frame = CGRectMake(50, 230, 60, 50); loginBtn.backgroundColor = [UIColor redColor]; [loginBtn setTitle:@"登陆" forState:UIControlStateNormal]; [loginBtn addTarget:self action:@selector(login:) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:loginBtn]; // ===================== UIButton * loginBtn2 = [UIButton buttonWithType:UIButtonTypeCustom]; loginBtn2.frame = CGRectMake(130, 230, 60, 50); loginBtn2.backgroundColor = [UIColor redColor]; [loginBtn2 setTitle:@"注册" forState:UIControlStateNormal]; [self addSubview:loginBtn2]; // ============210 230 100 50 UIButton * loginBtn3 = [UIButton buttonWithType:UIButtonTypeCustom]; loginBtn3.frame = CGRectMake(210, 230, 100, 50); loginBtn3.backgroundColor = [UIColor redColor]; [loginBtn3 setTitle:@"找回密码" forState:UIControlStateNormal]; // [loginBtn3 addTarget:self action:@selector(searchPsw:) forControlEvents:UIControlEventTouchUpInside]; [self addSubview:loginBtn3];二。视图控制器:
?自定义视图类继承UIView。在初始化?方法中添加?子视图控件。
重写controller的loadView?方法。创建?自定义视图对象,并指定为controller 的view。
将?子视图控件对象设置为?自定义视图类的属性,在viewDidLoad?方法中进 ?行设置:添加action、设置delegate等等。
在controller中添加按钮点击事件实现和代理?方法的实现
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. // self.view.backgroundColor = [UIColor greenColor]; // UISwitch *aSwitch = [[UISwitch alloc]initWithFrame:CGRectMake(200, 300, 50, 50)]; // [self.view addSubview:aSwitch]; // [aSwitch release]; // =============================== // 把LoginView给覆盖了 thirdViewController * thirdVC = [[thirdViewController alloc]init]; [self.view addSubview:thirdVC.view]; // retain [self addChildViewController:thirdVC]; [thirdVC release]; } // ======== - (void)loadView { LoginView * logV = [[LoginView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)]; self.view = logV; [logV release]; }三,检测屏幕旋转:
注意视图控制器会?自动调整view的?大?小以适应屏幕旋转,bounds
被修改,触发view的layoutSubviews?方法。
view重写layoutSubviews?方法,根据设备?方向,重新布局。
[UIApplication shareApplication].statusBarOrientation提供设备 当前?方向。
controller中:
-(NSUInteger)supportedInterfaceOrientations { // 设置当屏幕旋转时,字体是否跟着旋转,根据按位或运算 // 里面的方向数值为1,2,4,8.... // 比如3 = 1 + 2 表示两个方向 return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskPortrait; }view中:
// 重写 // 当视图需要重绘时,会执行该视图的layoutSubviews方法 - (void)layoutSubviews { // 获取设备的方向 if([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationLandscapeLeft || [UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationLandscapeRight) { UIView * v1 = [self viewWithTag:100]; // 这里需要重写setFrame方法 v1.frame = CGRectMake(50, 50, 400, 50); v1.backgroundColor = [UIColor redColor]; } else { UIView * v1 = [self viewWithTag:100]; v1.frame = CGRectMake(50, 50, 200, 50); v1.backgroundColor = [UIColor redColor]; } }四,处理内存警告:
控制器能监测内存警告,以便我们避免内存不够引起的crash。 在定义的controller?子类中重写didReceiveMemoryWarning?方法。 释放暂时不使?用的资源。(数据对象、图像)
controller的方法:
- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. // 当视图已经加载到内存,并没有显示在window上时,将视图置空 if ([self isViewLoaded] && self.view.window == nil) { self.view = nil; } }
UI开发----自定义视图和视图控制器(Controller)
标签:uilabel 控件 delegate uicontroller
原文地址:http://blog.csdn.net/guoxianzhuang/article/details/45048117