UIPickerView用法

UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectZero];

pickerView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth; //这里设置了就可以自定                                                                                                                           义高度了，一般默认是无法修改其216像素的高度

pickerView.dataSource = self;   //这个不用说了瑟

pickerView.delegate = self;       //这个不用说了瑟

pickerView.frame = CGRectMake(0, 84, 320, 100);

pickerView.showsSelectionIndicator = YES;    //这个最好写 你不写来试下哇

[self.view addSubview:pickerView];

[pickerView release];

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/****************************下面是数据源和代理的实现***********************************/

#pragma mark -

#pragma mark UIPickerViewDataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView

{

return 2;     //这个picker里的组键数

}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component

{

return [self.pickerNameArray count];  //数组个数

}

#pragma mark -

#pragma mark UIPickerViewDelegate

/************************重头戏来了************************/

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

{

UILabel *myView = nil;       

if (component == 0) {

myView = [[[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 100, 30)] autorelease];

myView.textAlignment = UITextAlignmentCenter;

myView.text = [pickerNameArray objectAtIndex:row];

myView.font = [UIFont systemFontOfSize:14];         //用label来设置字体大小

myView.backgroundColor = [UIColor clearColor];

}else {

myView = [[[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 180, 30)] autorelease];

myView.text = [pickerPlaceArray objectAtIndex:row];

myView.textAlignment = UITextAlignmentCenter;

myView.font = [UIFont systemFontOfSize:14];

myView.backgroundColor = [UIColor clearColor];

}

return myView;

}

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component

{

CGFloat componentWidth = 0.0;

if (component == 0)

componentWidth = 100.0; // 第一个组键的宽度  

else

componentWidth = 180.0; // 第2个组键的宽度

return componentWidth;

}

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component

{

return 40.0;

}

好 了， 下面看哈效果