UIPickerView的简单封装

UIPickerView的简单封装
在iOS实际项目中，经常会出现界面中多个地方需要使用UIPickerView,如果在每个需要用到的地方都创建一个UIPickerView不仅更耗性能，而且还会让你的代码变得更加杂乱、冗余，因此我在这里向大家介绍一下我对UIPickerView的一些简单封装。

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, SCREENHEIGHT -220, SCREENWIDTH, 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, SCREENHEIGHT, SCREENWIDTH, 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。