我正在尝试编写一个应用程序,该应用程序从名为Jan Kowalski的联系人拍摄照片并在屏幕上显示。
我是iOS和xCode的新手,所以我的代码中出现错误。
这是我的.m文件
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
//@synthesize labelNewImage;
@synthesize labelOldImage;
//@synthesize imageViewNew;
@synthesize imageViewOld;
- (void) changePositionOfView:(UIView *)paramView to:(CGFloat)paramY
{
CGRect viewFrame = paramView.frame;
viewFrame.origin.y = paramY;
paramView.frame = viewFrame;
}
- (void) createLabelAndImageViewForOldImage
{
self.labelOldImage = [[UILabel alloc] initWithFrame:CGRectZero];
self.labelOldImage.text = @"Obraz";
self.labelOldImage.font = [UIFont systemFontOfSize:16.0f];
[self.labelOldImage sizeToFit];
self.labelOldImage.center = self.view.center;
[self.view addSubview:self.labelOldImage];
[self changeYPositionOfView:[self.labelOldImage
to:80.0f]];// error - no visible @interface for 'UILabel' that declares the selector to
self.imageViewOld = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)];
self.imageViewOld.center = self.view.center;
self.imageViewOld.contentMode = UIViewContentModeScaleAspectFit;
[self.view addSubview:self.imageViewOld];
[self changeYPositionOfView:[self.imageViewOld to:105.0f]];
}
- (ABRecordRef)getPersonWithFirstName:(NSString *)paramFirstName
lastName:(NSString *)paramLastName
inAddressBook:(ABRecordRef)paramAddressBook
{
ABRecordRef result = NULL;
if (paramAddressBook == NULL) {
NSLog(@"Ksiazka ma wartosc NULL");
return NULL;
}
NSArray *allPeople = (__bridge_transfer NSArray *)
ABAddressBookCopyArrayOfAllPeople(paramAddressBook);
NSUInteger peopleCounter = 0;
for (peopleCounter=0; peopleCounter < [allPeople count]; peopleCounter++) {
ABRecordRef person = (__bridge ABRecordRef)
[allPeople objectAtIndex:peopleCounter];
NSString *firstName = (__bridge_transfer NSString *)
ABRecordCopyValue(person, kABPersonFirstNameProperty);
NSString *lastName = (__bridge_transfer NSString *)
ABRecordCopyValue(person, kABPersonLastNameProperty);
BOOL firstNameIsEqual = NO;
BOOL lastNameIsEqual = NO;
if ([firstName length] == 0 && [paramFirstName length] == 0)
{
firstNameIsEqual = YES;
}
else if ([firstName isEqualToString:paramFirstName])
{
firstNameIsEqual = YES;
}
if ([lastName length] == 0 && [paramLastName length] == 0)
{
lastNameIsEqual = YES;
}
else if ([lastName isEqualToString:paramLastName])
{
lastNameIsEqual = YES;
}
if (firstNameIsEqual && lastNameIsEqual) {
return person;
}
}
return result;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor blackColor];
[self createLabelAndImageViewForOldImage];
ABAddressBookRef addressBook = ABAddressBookCreate();
if (addressBook !=NULL) {
ABRecordRef janKowalski = [self getPersonWithFirstName:@"Jan" lastName:@"Kowalski" inAddressBook:addressBook];
if (janKowalski == NULL) {
NSLog(@"Nie znaleziono kontaktu tworzenie nowego.");
janKowalski = [self newPersonWithFirstName:@"Jan" // error - no visible @interface for 'ViewController' that declares the selector 'newPersonWithFirstName
lastName:@"Kowalski"
inAddressBook:addressBook];
}
if (janKowalski == NULL) {
NSLog(@"Nie udało się utworzyć nowego rekordu dla tego kontaktu.");
CFRelease(addressBook);
return;
}
self.imageViewOld.image = [[self getPersonImage]:janKowalski]; // error - no visible @interface for 'ViewController' delcares the selector 'getPersonImage'
}
}
和我的.h文件:
#import <UIKit/UIKit.h>
#import <AddressBook/AddressBook.h>
@interface ViewController : UIViewController
@property (strong, nonatomic) UILabel *labelOldImage;
@property (strong, nonatomic) UIImageView *imageViewOld;
@end
我收到这些“声明选择器为'UILabel'的不可见的@interface”错误。
你们能帮我找到解决问题的正确方法吗?
非常感谢!
最佳答案
放置方括号实际上只是一个错误。您已经定义了带有两个参数的方法...
changePositionOfView:(UIView *)paramView to:(CGFloat)paramY
...但是您只用一个来调用它...
[self changeYPositionOfView:[self.labelOldImage to:80.0f]];
检查括号是否匹配。
编译器认为您要调用
[self.labelOldImage to:80.0f]
并将结果传递给名为changeYPositionOfView:
的单参数方法。通过修复嵌套将值传递给两个参数:
[self changeYPositionOfView:self.labelOldImage to:80.0f];
关于ios - 方法没有可见的@interface声明选择器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28126350/