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UIPickerView的常见属性

栏目:综合技术时间:2015-04-09 09:11:24

1.UIPickerView

1.UIPickerView的常见属性

// 数据源(用来告知UIPickerView有多少列多少行)

@property(nonatomic,assignid<UIPickerViewDataSource> dataSource;

// 代理(用来告知UIPickerView1列的每1行显示甚么内容,监听UIPickerView的选择)

@property(nonatomic,assignid<UIPickerViewDelegate>   delegate;

// 是不是要显示选中的唆使器

@property(nonatomic)        BOOL                       showsSelectionIndicator;

// 1共有多少列

@property(nonatomic,readonly) NSInteger numberOfComponents;


2.UIPickerView的常见方法

// 重新刷新所有列

- (void)reloadAllComponents;

// 重新刷新第component

- (void)reloadComponent:(NSInteger)component;


// 主动选中第component列的第row

- (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated;


// 取得第component列确当前选中的行号

- (NSInteger)selectedRowInComponent:(NSInteger)component;


3.数据源方法(UIPickerViewDataSource)

//  1共有多少列

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;

//  component列1共有多少行

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;


4.代理方法(UIPickerViewDelegate)

//  component列的宽度是多少

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;

//  component列的行高是多少

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component;


//  component列第row行显示甚么文字

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;


//  component列第row行显示怎样的view(内容)

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view;


//  选中了pickerView的第component列第row

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component;


2.UIDatePicker

1.常见属性

// datePicker的显示模式

@property (nonatomic) UIDatePickerMode datePickerMode;

// 显示的区域语言

@property (nonatomicretain) NSLocale   *locale;


2.监听UIDatePicker的选择

由于UIDatePicker继承自UIControl,所以通过addTarget:...监听


3.程序启动的完全进程

1.main函数


2.UIApplicationMain

创建UIApplication对象

创建UIApplicationdelegate对象


3.delegate对象开始处理(监听)系统事件(没有storyboard)

程序启动终了的时候就会调用代理的application:didFinishLaunchingWithOptions:方法

application:didFinishLaunchingWithOptions:中创建UIWindow

创建和设置UIWindowrootViewController

显示窗口


3.根据Info.plist取得最主要storyboard的文件名,加载最主要的storyboard(storyboard)

创建UIWindow

创建和设置UIWindowrootViewController

显示窗口


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