如何使用标签创建五个UIPickerView？在iPhone中，如何为每个UIPickerView赋予不同的名称？

我现在有2个UIPickerView，我想稍后再添加3个。代码如下：

-(void)viewDidLoad{
Pos_x = 5;
Pos_y = 70;

for (i= 0; i<2; i++) {

myPickerView = [[UIPickerView alloc] init];
myPickerView.frame = CGRectMake(Pos_x,Pos_y,150,300);
myPickerView.tag = i;
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView];

if (i==0) {
// Init the data array.
Array_1 = [[NSMutableArray alloc] init];

// Add some data for demo purposes.
[Array_1 addObject:@"One"];
[Array_1 addObject:@"Two"];
[Array_1 addObject:@"Three"];
[Array_1 addObject:@"Four"];
[Array_1 addObject:@"Five"];
}

if (i==1) {

Array_2 = [[NSMutableArray alloc] init];

// Add some data for demo purposes.
[Array_2 addObject:@"One1"];
[Array_2 addObject:@"Two1"];
[Array_2 addObject:@"Three1"];
[Array_2 addObject:@"Four1"];
[Array_2 addObject:@"Five1"];  
}

Pos_x = Pos_x + 162;
}
}

现在我的问题是如何在两个UIPickerView上显示不同的数据？与pickerview.tag==0类似，它将显示return[Array_1 objectAtIndex:row]； 并且pickerview.tag==1它将显示return[Array_2 objectAtIndex:row]；？

---

欢迎您提出任何想法或建议。

您可以使用数组或字典来存储内容数组，并使用picker标记获取它们。例如

NSArray *contentArrays = [[NSArray alloc] initWithObjects:Array_1, Array_2, nil];

---

然后使用

[contentArrays objectAtIndex:pickerView.tag]获取内容数组
您可以通过设置pickerview的标记来执行此操作：

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger) { 
    if(pickerView.tag == 1)
     {
          // do something with picker one
     }
     else if(pickerView.tag == 2)
     {
          // the other picker
     }
}

否则：

   - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger) { 
        switch(pickerView.tag){
           case 1:
               //do something
               break;
           case 2:
               //do other thing
               break;
           default:
               break;
        }
    }

希望这有帮助

请同时查看此代码：
请检查此代码：

-(void)viewDidLoad{
myPickerView = [[UIPickerView alloc] init];
myPickerView.frame = CGRectMake(5,70,150,300);
//myPickerView.tag = i;
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView];

Array_1 = [[NSMutableArray alloc] init];

// Add some data for demo purposes.
[Array_1 addObject:@"One"];
[Array_1 addObject:@"Two"];
[Array_1 addObject:@"Three"];
[Array_1 addObject:@"Four"];
[Array_1 addObject:@"Five"];
[Array_1 addObject:@"Six"];


myPickerView_2nd = [[UIPickerView alloc] init];
myPickerView_2nd.frame = CGRectMake(167,70,150,300);
//myPickerView_2nd.tag = i;
myPickerView_2nd.delegate = self;
myPickerView_2nd.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView_2nd];

Array_2 = [[NSMutableArray alloc] init];

// Add some data for demo purposes.
[Array_2 addObject:@"One1"];
[Array_2 addObject:@"Two1"];
[Array_2 addObject:@"Three1"];
[Array_2 addObject:@"Four1"];
[Array_2 addObject:@"Five1"];
[Array_2 addObject:@"Six1"];

}


- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
if([pickerView isEqual: myPickerView]){
// return the appropriate number of components, for instance
return 1;
}

if([pickerView isEqual: myPickerView_2nd]){
// return the appropriate number of components, for instance
return 1;
}
else 
return 0;
}

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


if ( pickerView == myPickerView) // this is otherPickerview
{
    return [Array_1 count];


}
if ( pickerView == myPickerView_2nd){
    return [Array_2 count];


}
else{
     NSUInteger numRows = 5;
    return numRows;}

}

希望这能帮助你……
你不应该去
if（pickerView.tag==0）
而不是
if（i==0）
我已经做过了，但没用。我的意思是在titleForRow方法中，你去
if（i==0）
那里没有意义，因为
i
甚至没有定义。。除非你省略了一些代码
-(void)viewDidLoad{
myPickerView = [[UIPickerView alloc] init];
myPickerView.frame = CGRectMake(5,70,150,300);
//myPickerView.tag = i;
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView];

Array_1 = [[NSMutableArray alloc] init];

// Add some data for demo purposes.
[Array_1 addObject:@"One"];
[Array_1 addObject:@"Two"];
[Array_1 addObject:@"Three"];
[Array_1 addObject:@"Four"];
[Array_1 addObject:@"Five"];
[Array_1 addObject:@"Six"];


myPickerView_2nd = [[UIPickerView alloc] init];
myPickerView_2nd.frame = CGRectMake(167,70,150,300);
//myPickerView_2nd.tag = i;
myPickerView_2nd.delegate = self;
myPickerView_2nd.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView_2nd];

Array_2 = [[NSMutableArray alloc] init];

// Add some data for demo purposes.
[Array_2 addObject:@"One1"];
[Array_2 addObject:@"Two1"];
[Array_2 addObject:@"Three1"];
[Array_2 addObject:@"Four1"];
[Array_2 addObject:@"Five1"];
[Array_2 addObject:@"Six1"];

}


- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
if([pickerView isEqual: myPickerView]){
// return the appropriate number of components, for instance
return 1;
}

if([pickerView isEqual: myPickerView_2nd]){
// return the appropriate number of components, for instance
return 1;
}
else 
return 0;
}

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


if ( pickerView == myPickerView) // this is otherPickerview
{
    return [Array_1 count];


}
if ( pickerView == myPickerView_2nd){
    return [Array_2 count];


}
else{
     NSUInteger numRows = 5;
    return numRows;}

}