UIPickerView的用法总结

1.UIPickerView的初始化

	pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0f, 200.0f, 320.0f, 216.0f)];

	pickerView.delegate = self;  //指定Delegate

	pickerView.showsSelectionIndicator = YES; //显示选中框

2.实现UIPickerViewDelegate和UIPickerViewDataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView; //返回列数



- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component; //返回每列的最大行数



- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component; //每一列中每一行的具体内容



- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component //选中哪一列哪一行