這篇文章主要介紹iOS中如何封裝UIPickerView，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！

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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(shù)據(jù)數(shù)組:slDataArray,如果需要兩行，則兩個數(shù)組都需要賦值。

實現(xiàn)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(jù)兩個數(shù)組來初始化pickerView的內(nèi)容，即判斷第二個數(shù)組(mulDataArray)是否有數(shù)據(jù)，有數(shù)據(jù)的話代表加載兩列的pickerView，否則加載一列。

功能實現(xiàn)

-(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(xiàn)或者從上往下消失。

-(void)pickerViewReloadData{ [self.pickerView reloadAllComponents];}

刷新pickerView數(shù)據(jù)，加載另一個pickerView時，調(diào)用該方法刷新。

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