我在1个视图控件中有多个选择器视图。它可以在2个选择器视图中正常工作，但是当我添加它时，它会出现7＆＃34;预期表达式＆＃34;以下代码中的错误：
#pragma mark -
#pragma mark picker methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return kPICKERCOLUMN;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (pickerView.tag == kCATEGORYTYPEPICKERTAG)
return [categoryTypes count];
else
return [locationTypes count];
else
return [originatorTypes count];
else
return [destinationTypes count];
else
return [statusTypes count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (pickerView.tag == kCATEGORYTYPEPICKERTAG)
return [categoryTypes objectAtIndex:row];
else
return [locationTypes objectAtIndex:row];
else
return [originatorTypes objectAtIndex:row];
else
return [destinationTypes objectAtIndex:row];
else
return [statusTypes objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if (pickerView.tag == kCATEGORYTYPEPICKERTAG) {
NSString *categoryType = [categoryTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[categoryTypeBtn setTitle:categoryType forState:UIControlStateNormal];
}else {
NSString *locationType = [locationTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[locationTypeBtn setTitle:locationType forState:UIControlStateNormal];
}else {
NSString *originatorType = [originatorTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[originatorTypeBtn setTitle:originatorType forState:UIControlStateNormal];
}else {
NSString *destinationType = [destinationTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[destinationTypeBtn setTitle:destinationType forState:UIControlStateNormal];
}else {
NSString *statusType = [statusTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[statusTypeBtn setTitle:statusType forState:UIControlStateNormal];
}
}
所有7个错误都显示在单独的else行上。
希望它能让我错过一些简单的东西!!
非常感谢
更新
我现在所有的选择器视图都在工作。然而，唯一唯一改变的信息是最终按钮而不是每个按钮，具体取决于所选择的内容。
这是完整的.m文件：
#define kPICKERCOLUMN 1
#define kCATEGORYTYPEPICKERTAG 20
#define kLOCATIONTYPEPICKERTAG 21
#define kORIGINATORTYPEPICKERTAG 22
#define kDESTINATIONTYPEPICKERTAG 23
#define kSTATUSTYPEPICKERTAG 24
@implementation HomeViewController
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
categoryTypes = [[NSArray alloc] initWithObjects:@"Appetizers",@"Breakfast",@"Dessert",@"Drinks",
@"Main Dish/Entree", @"Salad", @"Side Dish", @"Soup", @"Snack",
@"Baby Food", @"Pet Food",nil];
locationTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue",
@"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken",
@"Chinese", @"Cuban",
@"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers",
@"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican",
@"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani",
@"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian",
@"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food",
@"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai",
@"Vietnamese",@"Wild Game",nil];
originatorTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue",
@"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken",
@"Chinese", @"Cuban",
@"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers",
@"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican",
@"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani",
@"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian",
@"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food",
@"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai",
@"Vietnamese",@"Wild Game",nil];
destinationTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue",
@"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken",
@"Chinese", @"Cuban",
@"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers",
@"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican",
@"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani",
@"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian",
@"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food",
@"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai",
@"Vietnamese",@"Wild Game",nil];
statusTypes = [[NSArray alloc] initWithObjects:@"African",@"American",@"Armenian",@"Barbecue",
@"Brazilian", @"British", @"Cajun", @"Central American", @"Chicken",
@"Chinese", @"Cuban",
@"Ethiopian", @"French", @"Greek", @"German", @"Hamburgers",
@"Homestyle Cooking", @"Indian", @"Irish", @"Italian", @"Jamaican",
@"Japanese", @"Korean", @"Mexican", @"Middle Eastern", @"Pakistani",
@"Pancakes /Waffles", @"Persian", @"Pizza", @"Polynesian", @"Russian",
@"Sandwiches", @"Seafood", @"Scandinavian", @"Spanish", @"Soul Food",
@"South American", @"Steak", @"Vegetarian", @"Tex-Mex", @"Thai",
@"Vietnamese",@"Wild Game",nil];
}
return self;
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
categoryTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)];
categoryTypePicker.tag = kCATEGORYTYPEPICKERTAG;
categoryTypePicker.showsSelectionIndicator = TRUE;
categoryTypePicker.dataSource = self;
categoryTypePicker.delegate = self;
categoryTypePicker.hidden = YES;
locationTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)];
locationTypePicker.backgroundColor = [UIColor blueColor];
locationTypePicker.tag = kLOCATIONTYPEPICKERTAG;
locationTypePicker.showsSelectionIndicator = TRUE;
locationTypePicker.hidden = YES;
locationTypePicker.dataSource = self;
locationTypePicker.delegate = self;
originatorTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)];
originatorTypePicker.backgroundColor = [UIColor blueColor];
originatorTypePicker.tag = kORIGINATORTYPEPICKERTAG;
originatorTypePicker.showsSelectionIndicator = TRUE;
originatorTypePicker.hidden = YES;
originatorTypePicker.dataSource = self;
originatorTypePicker.delegate = self;
destinationTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)];
destinationTypePicker.backgroundColor = [UIColor blueColor];
destinationTypePicker.tag = kDESTINATIONTYPEPICKERTAG;
destinationTypePicker.showsSelectionIndicator = TRUE;
destinationTypePicker.hidden = YES;
destinationTypePicker.dataSource = self;
destinationTypePicker.delegate = self;
statusTypePicker = [[UIPickerView alloc] initWithFrame:CGRectMake(0,250,400,160)];
statusTypePicker.backgroundColor = [UIColor blueColor];
statusTypePicker.tag = kSTATUSTYPEPICKERTAG;
statusTypePicker.showsSelectionIndicator = TRUE;
statusTypePicker.hidden = YES;
statusTypePicker.dataSource = self;
statusTypePicker.delegate = self;
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)eve
{
if ( !locationTypePicker.hidden) {
locationTypePicker.hidden = YES;
}
if ( !categoryTypePicker.hidden) {
categoryTypePicker.hidden = YES;
}
if ( !originatorTypePicker.hidden) {
originatorTypePicker.hidden = YES;
}
if ( !destinationTypePicker.hidden) {
destinationTypePicker.hidden = YES;
}
if ( !statusTypePicker.hidden) {
statusTypePicker.hidden = YES;
}
}
#pragma mark -
#pragma mark picker methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return kPICKERCOLUMN;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
switch (pickerView.tag) {
case kCATEGORYTYPEPICKERTAG:
return [categoryTypes count];;
break;
case kLOCATIONTYPEPICKERTAG:
return [locationTypes count];
break;
case kORIGINATORTYPEPICKERTAG:
return [originatorTypes count];
break;
case kDESTINATIONTYPEPICKERTAG:
return [destinationTypes count];
break;
case kSTATUSTYPEPICKERTAG:
return [statusTypes count];
break;
default:
break;
}
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
switch (pickerView.tag) {
case kCATEGORYTYPEPICKERTAG:
return [categoryTypes objectAtIndex:row];
break;
case kLOCATIONTYPEPICKERTAG:
return [locationTypes objectAtIndex:row];
break;
case kORIGINATORTYPEPICKERTAG:
return [originatorTypes objectAtIndex:row];
break;
case kDESTINATIONTYPEPICKERTAG:
return [destinationTypes objectAtIndex:row];
break;
case kSTATUSTYPEPICKERTAG:
return [statusTypes objectAtIndex:row];
break;
default:
break;
}
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if (pickerView.tag == kCATEGORYTYPEPICKERTAG) {
NSString *categoryType = [categoryTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[categoryTypeBtn setTitle:categoryType forState:UIControlStateNormal];
}else if (pickerView.tag == kLOCATIONTYPEPICKERTAG) {
NSString *locationType = [locationTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[locationTypeBtn setTitle:locationType forState:UIControlStateNormal];
}else if (pickerView.tag == kORIGINATORTYPEPICKERTAG) {
NSString *originatorType = [originatorTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[originatorTypeBtn setTitle:originatorType forState:UIControlStateNormal];
}else if (pickerView.tag == kDESTINATIONTYPEPICKERTAG) {
NSString *destinationType = [destinationTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[destinationTypeBtn setTitle:destinationType forState:UIControlStateNormal];
}else if (pickerView.tag == kSTATUSTYPEPICKERTAG) {
NSString *statusType = [statusTypes objectAtIndex:[pickerView selectedRowInComponent:0]];
[statusTypeBtn setTitle:statusType forState:UIControlStateNormal];
}
}
-(IBAction) showLocationTypePicker{
if ( categoryTypePicker.hidden) {
categoryTypePicker.hidden = NO;
[self.view addSubview:categoryTypePicker];
}
else {
categoryTypePicker.hidden = NO;
[categoryTypePicker removeFromSuperview];
}
if ( originatorTypePicker.hidden) {
originatorTypePicker.hidden = NO;
[self.view addSubview:originatorTypePicker];
}
else {
originatorTypePicker.hidden = NO;
[originatorTypePicker removeFromSuperview];
}
if ( destinationTypePicker.hidden) {
destinationTypePicker.hidden = NO;
[self.view addSubview:destinationTypePicker];
}
else {
destinationTypePicker.hidden = NO;
[destinationTypePicker removeFromSuperview];
}
if ( statusTypePicker.hidden) {
statusTypePicker.hidden = NO;
[self.view addSubview:statusTypePicker];
}
else {
statusTypePicker.hidden = NO;
[statusTypePicker removeFromSuperview];
}
}
-(IBAction) showCategoryTypePicker{
if ( locationTypePicker.hidden) {
locationTypePicker.hidden = NO;
[self.view addSubview:locationTypePicker];
}
else {
locationTypePicker.hidden = NO;
[locationTypePicker removeFromSuperview];
}
if ( originatorTypePicker.hidden) {
originatorTypePicker.hidden = NO;
[self.view addSubview:originatorTypePicker];
}
else {
originatorTypePicker.hidden = NO;
[originatorTypePicker removeFromSuperview];
}
if ( destinationTypePicker.hidden) {
destinationTypePicker.hidden = NO;
[self.view addSubview:destinationTypePicker];
}
else {
destinationTypePicker.hidden = NO;
[destinationTypePicker removeFromSuperview];
}
if ( statusTypePicker.hidden) {
statusTypePicker.hidden = NO;
[self.view addSubview:statusTypePicker];
}
else {
statusTypePicker.hidden = NO;
[statusTypePicker removeFromSuperview];
}
}
-(IBAction) showOriginatorTypePicker{
if ( locationTypePicker.hidden) {
locationTypePicker.hidden = NO;
[self.view addSubview:locationTypePicker];
}
else {
locationTypePicker.hidden = NO;
[locationTypePicker removeFromSuperview];
}
if ( categoryTypePicker.hidden) {
categoryTypePicker.hidden = NO;
[self.view addSubview:categoryTypePicker];
}
else {
categoryTypePicker.hidden = NO;
[categoryTypePicker removeFromSuperview];
}
if ( destinationTypePicker.hidden) {
destinationTypePicker.hidden = NO;
[self.view addSubview:destinationTypePicker];
}
else {
destinationTypePicker.hidden = NO;
[destinationTypePicker removeFromSuperview];
}
if ( statusTypePicker.hidden) {
statusTypePicker.hidden = NO;
[self.view addSubview:statusTypePicker];
}
else {
statusTypePicker.hidden = NO;
[statusTypePicker removeFromSuperview];
}
}
-(IBAction) showDestinationTypePicker{
if ( locationTypePicker.hidden) {
locationTypePicker.hidden = NO;
[self.view addSubview:locationTypePicker];
}
else {
locationTypePicker.hidden = NO;
[locationTypePicker removeFromSuperview];
}
if ( originatorTypePicker.hidden) {
originatorTypePicker.hidden = NO;
[self.view addSubview:originatorTypePicker];
}
else {
originatorTypePicker.hidden = NO;
[originatorTypePicker removeFromSuperview];
}
if ( categoryTypePicker.hidden) {
categoryTypePicker.hidden = NO;
[self.view addSubview:categoryTypePicker];
}
else {
categoryTypePicker.hidden = NO;
[categoryTypePicker removeFromSuperview];
}
if ( statusTypePicker.hidden) {
statusTypePicker.hidden = NO;
[self.view addSubview:statusTypePicker];
}
else {
statusTypePicker.hidden = NO;
[statusTypePicker removeFromSuperview];
}
}
-(IBAction) showStatusTypePicker{
if ( locationTypePicker.hidden) {
locationTypePicker.hidden = NO;
[self.view addSubview:locationTypePicker];
}
else {
locationTypePicker.hidden = NO;
[locationTypePicker removeFromSuperview];
}
if ( originatorTypePicker.hidden) {
originatorTypePicker.hidden = NO;
[self.view addSubview:originatorTypePicker];
}
else {
originatorTypePicker.hidden = NO;
[originatorTypePicker removeFromSuperview];
}
if ( destinationTypePicker.hidden) {
destinationTypePicker.hidden = NO;
[self.view addSubview:destinationTypePicker];
}
else {
destinationTypePicker.hidden = NO;
[destinationTypePicker removeFromSuperview];
}
if ( categoryTypePicker.hidden) {
categoryTypePicker.hidden = NO;
[self.view addSubview:categoryTypePicker];
}
else {
categoryTypePicker.hidden = NO;
[categoryTypePicker removeFromSuperview];
}
}
- (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.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[locationTypes release];
[categoryTypes release];
[originatorTypes release];
[destinationTypes release];
[statusTypes release];
[categoryTypePicker release];
[locationTypePicker release];
[originatorTypePicker release];
[destinationTypePicker release];
[statusTypePicker release];;
[super dealloc];
}
答案 0 :(得分：1)
语法问题很简单：那些其他需要的条件，例如：
if (pickerView.tag == kCATEGORYTYPEPICKERTAG)
return [categoryTypes count];
else if (pickerView.tag == kSOMEOTHERTAG_THAT_MEANS_USE_LOCATION_TYPES)
return [locationTypes count];
else if (// etc.
if可以有一个没有条件的else。其含义是，else条件是if的补充，即....
if (someCondition) {
// some statements
} else { // this implies: else if (!someCondition)
// some statements
}
但不止一个变得含糊不清。 switch声明是更好的选择......
switch (pickerView.tag) {
case kCATEGORYTYPEPICKERTAG:
return categoryTypes count];
break;
case kSOMEOTHERTAG_THAT_MEANS_USE_LOCATION_TYPES:
return [locationTypes count];
// etc
default:
break;
}
但我想知道逻辑是否有意义，切换选择器视图的标签。你会这样做来区分许多选择器视图 - 这是你的意思吗？也许条件分支应该在单个选择器视图中被选中（selectedRow）？