我读到某个地方,在一个对象中使用NSString,必须使用copy而不是retain.有人可以解释这是否正确,为什么？
例如,我的单身人士有以下声明:
#import <foundation/Foundation.h>
@class FaxRecipient;
@interface MyManager : NSObject {
NSString *subject;
NSString *reference;
NSString *coverSheet;
FaxRecipient *faxRecipient;
}
@property (nonatomic, retain) NSString *test1;
@property (nonatomic, retain) NSString *test2;
@property (nonatomic, retain) NSString *test3;
@property (nonatomic,retain) FaxRecipient *faxRecipient;
+ (id)sharedManager;
@end
我有以下代码:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
但是我对如何获取所有文件名并将它们分配给数组一无所知？
任何帮助,将不胜感激.
NSNumber * latitude = [NSNumber numberWithDouble:[[cityDictionary valueForKeyPath:@"coordinates.latitude"]doubleValue]];
NSNumber * longitude = [NSNumber numberWithDouble:[[cityDictionary valueForKeyPath:@"coordinates.longitude"]doubleValue]];
CLLocation *listingLocation = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
我在上面第3行收到以下错误:
Sending 'NSNumber *__strong' to parameter of incompatible type 'CLLocationDegrees' (aka 'double')
我知道这是因为我试图将NSNumber传递到一个预期会有双倍的地方.但由于ARC,铸造不起作用？
我正在尝试在我的Symfony 2.3项目中进行BDD,并且似乎正在努力解决一些不一致问题.
根据我是否使用BehatContext或MinkContext作为FeatureContext类的基类,我得到的结果不同.
如果我使用:
class FeatureContext extends BehatContext
一切都好.但是,如果我使用:
class FeatureContext extends MinkContext
我得到错误,使得它看起来像MinkContext不喜欢我的正则表达式不再是系统自己生成的.你能帮我理解一下吗
FFFFFFF
(::) failed steps (::)
01. Ambiguous match of "I am on homepage":
to `/^I am on homepage$/` from Main\ReferralCaptureBundle\Features\Context\FeatureContext::iAmOnHomepage()
to `/^(?:|I )am on (?:|the )homepage$/` from Behat\MinkExtension\Context\MinkContext::iAmOnHomepage()
In step `Given I am on homepage'.
From scenario `Successful registration when user provides all the required info'. # src/Main/ReferralCaptureBundle/Features/registration.feature:12
Of feature `registration'. # src/Main/ReferralCaptureBundle/Features/registration.feature
02. Ambiguous match of "I follow "sign up"":
to `/^I follow "([^"]*)"$/` from …NSMutableArray *sortedReleases = [theReleases sortedArrayUsingComparator:^(id a, id b)
我得到以下内容:
不兼容的指针类型使用"NSArray*"类型的表达式初始化"NSMutableArray*"
我必须将sortedReleases作为NSMutableArray.我如何通过它？
谢谢
我有一个自定义对象,如:
#import <Foundation/Foundation.h>
@interface FaxRecipient : NSObject {
NSString * contactID;
NSString * name;
NSString * fax;
NSString * company;
NSString * phone;
}
@property(nonatomic,retain)NSString *contactID;
@property(nonatomic,retain)NSString *name;
@property(nonatomic,retain)NSString *fax;
@property(nonatomic,retain)NSString *company;
@property(nonatomic,retain)NSString *phone;
@end
我有一个包含FaxRecipient对象的NSMutableArray(remoteRecipientItems)数组.
但是,我试图通过使用名称设置UITableView单元格的值:
[[cell textLabel]setText:[remoteRecipientItems objectAtIndex:[indexPath row]]]; //I want to only use the name value of FaxRecipient. Sorry for the newbie question.