我试图在选择器视图中设置两个组件的宽度。它们的宽度相等,我想把它做得更宽。出于这个原因,我使用了
方法。
我的问题是,在我设置了方法后,我只返回一个组件而不是两个组件。我已经检查过我是否写错了方法,但找不到任何错误。
知道什么是错的吗?
以下是代码:
#import "BIDDependentComponentPickerViewController.h"
@implementation BIDDependentComponentPickerViewController
@synthesize picker;
@synthesize stateZips;
@synthesize states;
@synthesize zips;
- (IBAction)buttonPressed:(id)sender
{
NSInteger stateRow = [picker selectedRowInComponent:kStateComponent];
NSInteger zipRow = [picker selectedRowInComponent:kZipComponent];
NSString *state = [self.states objectAtIndex:stateRow];
NSString *zip = [self.zips objectAtIndex:zipRow];
NSString *title= [[NSString alloc] initWithFormat:@"You selected zip code %@.", zip];
NSString *message = [[NSString alloc] initWithFormat:@"@% is in @%", zip, state];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
message:message
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (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];
// Do any additional setup after loading the view from its nib.
NSBundle *bundle = [NSBundle mainBundle];
NSURL *plistURL = [bundle URLForResource:@"statedictionary" withExtension:@"plist"];
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfURL:plistURL];
self.stateZips = dictionary;
NSArray *components = [self.stateZips allKeys];
NSArray *sorted = [components sortedArrayUsingSelector:@selector(compare:)];
self.states = sorted;
NSString *selectedState = [self.states objectAtIndex:0];
NSArray *array = [stateZips objectForKey:selectedState];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.picker = nil;
self.stateZips = nil;
self.states = nil;
self.zips = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark
#pragma mark Picker Data Source Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component == kStateComponent) {
return [self.states count];
return [self.zips count];
}
}
#pragma mark Picker Delegate Methods
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if(component == kStateComponent)
return [self.states objectAtIndex:row];
return [self.zips objectAtIndex:row];
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (component == kStateComponent)
{
NSString *selectedState = [self.states objectAtIndex:row];
NSArray *array = [stateZips objectForKey:selectedState];
self.zips = array;
[picker selectRow:0 inComponent:kZipComponent animated:YES];
[picker reloadComponent:kZipComponent];
}
}
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
if (component == kZipComponent) {
return 90;
return 200;
}
}
@end
答案 0 :(得分:1)
该行:
return 200;
永远不会到达。它应该在IF语句之外,如下:
if (component == kZipComponent) {
return 90.0;
}
return 200.0;
否则,您的方法不会为除kZipComponent之外的任何组件返回值(因此其他组件的宽度为0)。