前言
在iOS實際項目中,經常會出現界面中多個地方需要使用UIPickerView,如果在每個需要用到的地方都創建一個UIPickerView不僅更耗性能,而且還會讓你的代碼變得更加雜亂、冗余,因此我在這里向大家介紹一下我對UIPickerView的一些簡單封裝。
所需屬性
/** pickerView*/@property (nonatomic, strong) UIPickerView pickerView;/* pickerView背景*/@property (nonatomic, strong) UIView pickerBackGroundView;/* 背景*/@property (nonatomic, strong) UIView backGroundView;/* 確認按鈕*/@property (nonatomic, strong) UIButton sureButton;/* 取消按鈕*/@property (nonatomic, strong) UIButton cancelButton;/* 單列pickerView*/@property (nonatomic, strong) NSMutableArray slDataArray;/* 雙列pickerView*/@property (nonatomic, strong) NSMutableArray *mulDataArray;
如果只需要一列的話,只需要傳入一個數據數組:slDataArray,如果需要兩行,則兩個數組都需要賦值。
實現UIPickerView代理方法
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ if (self.mulDataArray.count == 0) { return 1; }else { return 2; }}-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ if (component == 0) { return self.slDataArray.count; }else { return self.mulDataArray.count; }}-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{ if (component == 0) { return self.slDataArray[row]; }else { return self.mulDataArray[row]; }}
這里根據兩個數組來初始化pickerView的內容,即判斷第二個數組(mulDataArray)是否有數據,有數據的話代表加載兩列的pickerView,否則加載一列。
功能實現
-(void)pickerViewSelectRow:(NSInteger)row{ self.selectRow = row; [self.pickerView selectRow:row inComponent:0 animated:NO];}-(void)pickerViewSelectRow:(NSInteger)row lastRow:(NSInteger)lastRow{ [self.pickerView selectRow:row inComponent:0 animated:NO]; [self.pickerView selectRow:lastRow inComponent:1 animated:NO];}
第一個方法是只有一列的pickerView初始化是讓其選中哪行,第二個則是兩列的選擇方法。
-(void)showOrHidePickerView:(BOOL)isShow{ if (isShow) { if (self.isPickerShow == NO) { [self addSubview:self.backGroundView]; [self addSubview:self.pickerBackGroundView]; [UIView animateWithDuration:0.3 animations:^{ self.backGroundView.alpha = 0.5; self.pickerBackGroundView.frame = CGRectMake(0, SCREEN_HEIGHT -220, SCREEN_WIDTH, 220); } completion:^(BOOL finished) { self.isPickerShow = YES; }]; } }else { if (self.isPickerShow) { [UIView animateWithDuration:0.3 animations:^{ self.backGroundView.alpha = 0.0; self.pickerBackGroundView.frame = CGRectMake(0, SCREEN_HEIGHT, SCREEN_WIDTH, 220); } completion:^(BOOL finished) { [self.backGroundView removeFromSuperview]; [self.pickerBackGroundView removeFromSuperview]; self.isPickerShow = NO; }]; } }}
這個方法是顯示或者隱藏pickerView,通過動畫的方式,背景慢慢變黑或者透明,pickerView從下往上出現或者從上往下消失。
-(void)pickerViewReloadData{ [self.pickerView reloadAllComponents];}
刷新pickerView數據,加載另一個pickerView時,調用該方法刷新。
總結
以上就是這篇文章的全部內容了,希望本文的內容對大家的學習或者工作具有一定的參考學習價值,謝謝大家對武林網的支持。
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