如何解决一个UIPickerView两个数据源/视图工作一次，然后崩溃
|| 我正在尝试在我的应用程序中显示一个UIPickerView，并且取决于选择了哪个按钮，UIPickView将弹出并填充所选按钮的相关数据。不确定是否重要，但是一个UIPickerView有三列，一列有两列。当分隔开时，我可以使它们都完美地工作，但是当它们中断if语句时，我将它们嵌套的那一刻。 第三次，当我选择触发相反的UIPickerView的按钮时，它崩溃并给我NSRangeException错误，并且它试图在数组[0 ... 1]中的索引2处找到对象。我的理解是该程序认为数组中某个点中存在一个不存在的对象。 我尝试了[picker reloadAllComponents]方法，并在每次选择按钮时调用它，但是如上所述，它只能工作一次，然后退出。奇怪的是，如果我选择第二组代码所按下的按钮，它将可以完美地工作。当我选择一个按钮时，它会使UIPickerView不得不更改其视图，从而使其崩溃。 我真的是iOS开发和Objective C的新手，希望那里的人知道我做错了什么。我将发布你们需要的任何代码，并发布一些示例以了解发生了什么。 这是将int设置为2并调用该方法以显示选择器的button方法之一。-(IBAction)linePopupPicker{
picker = 2;
[self pickerShow];
}
-(IBAction)namePicker{
field = 1;
picker = 1;
NSLog(@\"The value of field is:%i\",field);
NSUserDefaults *pickerViewSelectionDefaults = [NSUserDefaults standardUserDefaults];
[tipPicker selectRow:[pickerViewSelectionDefaults integerForKey:@\"pickerViewSelectionKey\"] inComponent:0 animated:NO];
[tipPicker selectRow:[pickerViewSelectionDefaults integerForKey:@\"pickerViewNameColor\"] inComponent:1 animated:NO];
[tipPicker selectRow:[pickerViewSelectionDefaults integerForKey:@\"pickerViewNameFontSize\"] inComponent:2 animated:NO];
[self pickerShow];
}
-(IBAction)pickerShow{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.5];
CGAffineTransform transform = CGAffineTransformMakeTranslation(0,240);
pickerView.transform = transform;
[self.view addSubview:pickerView];
[tipPicker reloadAllComponents];
[UIView commitAnimations];
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
if (picker ==2) {
switch (component)
{
case 0:
{
UILabel *lineColorLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0,130,44)] autorelease];
lineColorLabel.backgroundColor = [UIColor clearColor];
NSString *lineTempColor = [colorArray1 objectAtIndex:row];
//NSLog(@\"The String Color Name:%@\",tempColor);
UIColor *myColor1 = [UIColor performSelector:NSSelectorFromString(lineTempColor)];
lineColorLabel.backgroundColor = myColor1;
return lineColorLabel;
}
case 1:
{
UILabel *alphaLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0,40,44)] autorelease];
alphaLabel.text = [alphaArray objectAtIndex:row];
alphaLabel.font = [UIFont systemFontOfSize:18];
alphaLabel.textAlignment = UITextAlignmentCenter;
alphaLabel.backgroundColor = [UIColor clearColor];
alphaLabel.shadowColor = [UIColor whiteColor];
return alphaLabel;
}
default:
break;
}
}
else if (picker == 1)
{
switch (component)
{
case 0:
{
UILabel *fontLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0,44)] autorelease];
fontLabel.backgroundColor = [UIColor clearColor];
fontLabel.shadowColor = [UIColor whiteColor];
fontLabel.text = [fontNames objectAtIndex:row];
NSString *font = [fontNames objectAtIndex:row];
fontLabel.font = [UIFont fontWithName:font size:18.0];
fontLabel.textAlignment = UITextAlignmentLeft;
return fontLabel;
}
case 1:
{
UILabel *colorLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0,35,44)] autorelease];
NSString *tempColor = [colorArray objectAtIndex:row];
//NSLog(@\"The String Color Name:%@\",tempColor);
UIColor *myColor = [UIColor performSelector:NSSelectorFromString(tempColor)];
colorLabel.backgroundColor = myColor;
return colorLabel;
}
case 2:
{
UILabel *sizeLabel = [[[UILabel alloc] initWithFrame:CGRectMake(0,44)] autorelease];
sizeLabel.text = [fontSizeArray objectAtIndex:row];
sizeLabel.font = [UIFont systemFontOfSize:18];
sizeLabel.textAlignment = UITextAlignmentCenter;
sizeLabel.backgroundColor = [UIColor clearColor];
sizeLabel.shadowColor = [UIColor whiteColor];
return sizeLabel;
}
default:
break;
}
}
return 0;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
if (picker == 2) {
return 2;
}else if (picker == 1) {
return 3;
}
//return 3;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component { // This method also needs to be used. This asks how many rows the UIPickerView will have.
if (picker == 2) {
if (component == 0) {
return [colorArray1 count];
}
return [alphaArray count];
}else if (picker == 1) {
if (component == 0) {
return [fontNames count];
}else if (component == 1) {
return [colorArray count];
}
return [fontSizeArray count];
}
}
解决方法
if ( picker == 2)
case 1
- (void) savePickerOne {
[pickerViewSelectionDefaults setInteger:[tipPicker selectedRowInComponent:0] ForKey:@\"pickerViewSelectionKey\"];
[pickerViewSelectionDefaults setInteger:[tipPicker selectedRowInComponent:1] ForKey:@\"pickerViewNameColor\"];
[pickerViewSelectionDefaults setInteger:[tipPicker selectedRowInComponent:2] ForKey:@\"pickerViewNameFontSize\"];
}
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