UIPickerView显示不同的WebView

时间：2012-02-18 13:55:35

标签： iphone objective-c ios5 xcode4.2 uipickerview

我试图用UIPickerView控制我的UIWebView，以显示不同的PDF文件。但不知何故，我的代码没有。如果我选择某一行或显示错误的PDF，它会崩溃。有什么想法吗？

#import "PickerViewTutorialViewController.h"

@implementation PickerViewTutorialViewController

@synthesize pickerView;

- (void)dealloc
{
    [super dealloc];
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self populateArray1];
    [self populateArray2];
}

- (void)populateArray1 {
    array1 = [[NSMutableArray alloc] init];
    [array1 addObject:@"1"];
    [array1 addObject:@"2"];
    [array1 addObject:@"3"];
    [array1 addObject:@"4"];
    [array1 addObject:@"5"];
    [array1 addObject:@"6"];
}
- (void)populateArray2 {
    array2 = [[NSMutableArray alloc] init];
    [array2 addObject:@"A"];
    [array2 addObject:@"B"];
    [array2 addObject:@"C"];
}


- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark -
#pragma mark picker view methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
    return 2;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if ([[array1 objectAtIndex:row] isEqual:@"1"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_1A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_1B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_1C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"2"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_2A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_2B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_2C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"3"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_3A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_3B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_3C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"4"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_4A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_4B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_4C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"5"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_5A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_5B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_5C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"6"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_6A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_6B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_6C.pdf"]]]]; }
    }
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
    if (component == 0) {
        return [array1 count];
    }
    else {
        return [array2 count];
    }
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
    if (component == 0) {
        return [array1 objectAtIndex:row];
    }
    else {
        return [array2 objectAtIndex:row];
    }
}

@end

2 个答案:

答案 0 :(得分：0)

首先，由于您处理行选择的方式，您的代码崩溃了。 你的第二个对象数组（array2）只有3个对象（索引为0,1,2），但是如果你选择第一个组件中的第4个对象，你将尝试访问array2中索引3处的对象，这样你就会得到一个“出界”的例外。

我建议你用这种方法重写你的逻辑：

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

您应该使用inComponent:(NSInteger)component部分来优化代码

我希望这会有所帮助。

答案 1 :(得分：0)

请注意，您可以替换所有代码：

    if ([[array1 objectAtIndex:row] isEqual:@"1"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_1A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_1B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_1C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"2"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_2A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_2B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_2C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"3"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_3A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_3B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_3C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"4"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_4A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_4B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_4C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"5"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_5A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_5B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_5C.pdf"]]]]; }
    }
    if ([[array1 objectAtIndex:row] isEqual:@"6"]) {
        if ([[array2 objectAtIndex:row] isEqual:@"A"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_6A.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"B"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_6B.pdf"]]]]; }
        if ([[array2 objectAtIndex:row] isEqual:@"C"]) {
            stundenplan.scalesPageToFit = YES;
            [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Stundenplan_6C.pdf"]]]]; }
    }

人：

NSString *numberString = [array1 objectAtIndex:row];
NSString *letterString = [array2 objectAtIndex:row];
NSString *pathComponentString = [NSString stringWithFormat:@"Stundenplan_%@%@.pdf", numberString, letterString];
stundenplan.scalesPageToFit = YES;
[stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:pathComponentString]]]];

在前两行（简化代码）中，您会看到问题：当行为3或更大时，您无法调用长度仅为3的[array2 objectAtIndex:row];。

修改

您可以使用以下方法：

- (NSInteger)selectedRowInComponent:(NSInteger)component;

确定字母和数字的正确索引：

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSString *numberString = [array1 objectAtIndex:[pickerView selectedRowInComponent:0]];
    NSString *letterString = [array2 objectAtIndex:[pickerView selectedRowInComponent:1]];
    NSString *pathComponentString = [NSString stringWithFormat:@"Stundenplan_%@%@.pdf", numberString, letterString];
    stundenplan.scalesPageToFit = YES;
    [stundenplan loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:pathComponentString]]]];
}
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