UIPickerView的常見屬性

1.UIPickerView

1.UIPickerView的常見屬性

// 數據源(用來告知UIPickerView有多少列多少行)

@property(nonatomic,assign) id<UIPickerViewDataSource> dataSource;

// 代理(用來告知UIPickerView每1列的每1行顯示甚么內容,監聽UIPickerView的選擇)

@property(nonatomic,assign) id<UIPickerViewDelegate>   delegate;

// 是不是要顯示選中的唆使器

@property(nonatomic)        BOOL                       showsSelectionIndicator;

// 1共有多少列

@property(nonatomic,readonly) NSInteger numberOfComponents;

2.UIPickerView的常見方法

// 重新刷新所有列

- (void)reloadAllComponents;

// 重新刷新第component列

- (void)reloadComponent:(NSInteger)component;

// 主動選中第component列的第row行

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

// 取得第component列確當前選中的行號

- (NSInteger)selectedRowInComponent:(NSInteger)component;

3.數據源方法(UIPickerViewDataSource)

//  1共有多少列

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

//  第component列1共有多少行

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

4.代理方法(UIPickerViewDelegate)

//  第component列的寬度是多少

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

//  第component列的行高是多少

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

//  第component列第row行顯示甚么文字

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

//  第component列第row行顯示怎樣的view(內容)

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

//  選中了pickerView的第component列第row行

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

2.UIDatePicker

1.常見屬性

// datePicker的顯示模式

@property (nonatomic) UIDatePickerMode datePickerMode;

// 顯示的區域語言

@property (nonatomic, retain) NSLocale   *locale;

2.監聽UIDatePicker的選擇

* 由于UIDatePicker繼承自UIControl,所以通過addTarget:...監聽

3.程序啟動的完全進程

1.main函數

2.UIApplicationMain

* 創建UIApplication對象

* 創建UIApplication的delegate對象

3.delegate對象開始處理(監聽)系統事件(沒有storyboard)

* 程序啟動終了的時候, 就會調用代理的application:didFinishLaunchingWithOptions:方法

* 在application:didFinishLaunchingWithOptions:中創建UIWindow

* 創建和設置UIWindow的rootViewController

* 顯示窗口

3.根據Info.plist取得最主要storyboard的文件名,加載最主要的storyboard(有storyboard)

* 創建UIWindow

* 創建和設置UIWindow的rootViewController

* 顯示窗口

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