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这篇文章主要介绍iOS中如何封装UIPickerView，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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所需属性
/** pickerView*/@property (nonatomic, strong) UIPickerView pickerView;/* pickerView背景*/@property (nonatomic, strong) UIView pickerBackGroundView;/* 背景*/@property (nonatomic, strong) UIView backGroundView;/* 确认按钮*/@property (nonatomic, strong) UIButton sureButton;/* 取消按钮*/@property (nonatomic, strong) UIButton cancelButton;/* 单列pickerView*/@property (nonatomic, strong) NSMutableArray slDataArray;/* 双列pickerView*/@property (nonatomic, strong) NSMutableArray *mulDataArray;
如果只需要一列的话，只需要传入一个数据数组:slDataArray,如果需要两行，则两个数组都需要赋值。
实现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]; }}
这里根据两个数组来初始化pickerView的内容，即判断第二个数组(mulDataArray)是否有数据，有数据的话代表加载两列的pickerView，否则加载一列。
功能实现
-(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];}
第一个方法是只有一列的pickerView初始化是让其选中哪行，第二个则是两列的选择方法。
-(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; }]; } }}
这个方法是显示或者隐藏pickerView,通过动画的方式，背景慢慢变黑或者透明，pickerView从下往上出现或者从上往下消失。
-(void)pickerViewReloadData{ [self.pickerView reloadAllComponents];}
刷新pickerView数据，加载另一个pickerView时，调用该方法刷新。
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