UIpickerView的使用

2019-11-09 16:33:05

字體：大中小

供稿：網(wǎng)友

UipickerView類似于UItableView，使用方法非常相似；自定義MJPickerView，繼承自UIpickerView；遵守兩個協(xié)議：UIPickerDataSource和UIPickerDelegate;設(shè)置數(shù)據(jù)源和代理；

1、兩個數(shù)據(jù)源方法

1、此方法返回的是列數(shù) - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ return 2;} 2、此方法返回的是每一列的行數(shù) - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{if (component == 0) { return _listOne.count;} return _listTwo.count; }

2、代理方法：

1、設(shè)置每列寬度 - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {if (self.listTwo) { if (component == 1) { return [UIScreen mainScreen].bounds.size.width - 120; } return 120;}return [UIScreen mainScreen].bounds.size.width;}2、設(shè)置每一列的每一行的顯示數(shù)據(jù)，如果不實現(xiàn)這個代理方法，效果如下圖所示：-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{if (component == 0) { return [_listOne objectAtIndex:row];} else { return [_listTwo objectAtIndex:row]; }} 3、獲取選中的行列，得到數(shù)組中的數(shù)據(jù)- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{if (component == 0) { _selectedStrFromOneList = [_listOne objectAtIndex:row];} else { _selectedStrFromTwoList = [_listTwo objectAtIndex:row];}}

沒有實現(xiàn)titileForRow這個代理方法的效果：

沒有實現(xiàn)titileForRow這個代理方法的效果

3、設(shè)置為UITextField的inputView

self.cellTextFld.inputView = self.pickerV;

4、自定義toolBar，設(shè)置為UITextField的input accessoryView

UIBarButtonItem *cancelItem = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(resignFirResponder)]; //占位用 UIBarButtonItem *selectItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithTitle:@"確定" style:UIBarButtonItemStyleDone target:self action:@selector(complete)];UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; [toolBar setItems:@[cancelItem,selectItem,doneItem]]; self.cellTextFld.inputAccessoryView = toolBar;

剩下的數(shù)據(jù)傳遞了，就非常簡單了；

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