是否可以取消prepareForSegue:方法中的segue ?
我想在segue之前执行一些检查,如果条件不为真(在这种情况下,如果某些UITextField是空的),则显示错误消息而不是执行segue.
UITableView 设置为静态单元格.
是否有可能以编程方式隐藏一些单元格?
在WWDC 2013视频中,Apple建议在iOS 7的表格视图中显示选择器.如何在表格视图单元格之间插入和动画视图?
像这样,从Apple日历应用程序:

我在执行insertItemsAtIndexPaths中遇到此错误UICollectionView
断言失败:
-[UICollectionViewData indexPathForItemAtGlobalIndex:],
/SourceCache/UIKit/UIKit-2372/UICollectionViewData.m:442
2012-09-26 18:12:34.432
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException',
reason: 'request for index path for global index 805306367
when there are only 1 items in the collection view'
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我检查过,我的数据源只包含一个元素.有关为何会发生这种情况的任何见解?如果需要更多信息,我绝对可以提供.
我总是尝试以这种方式从tableView中的单元格呈现一个popover:
[myPopover presentPopoverFromRect:cell.frame inView:self.tableView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
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但是我不能使用UIPopoverArrowDirectionRight或Left,因为根据ipad(纵向或横向)的位置,popover会出现在其他地方.
我是以正确的方式呈现弹出窗口吗?
PS:表视图位于splitView的detailView中.
placemark = [[MKPlacemark alloc]initWithCoordinate:storedCoordinate addressDictionary:addressDict];
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我试图创建字典用于上面的代码,但没有任何作用:(
NSDictionary *addressDict = [[NSDictionary alloc] initWithObjectsAndKeys:
location.countryCode, @"CountryCode",
location.country,@"kABPersonAddressCountryKey",
location.state, kABPersonAddressStateKey,
location.city, @"City",
location.street, kABPersonAddressStreetKey,
location.zip, kABPersonAddressZIPKey,
nil];
Run Code Online (Sandbox Code Playgroud) 我试图让iCloud与我的应用程序一起工作,如果用户请求,它需要将现有的本地存储迁移到无处不在的商店.
经过围绕Apple开发论坛和其他地方的一些关注之后,我采用了这种方法,这种方法并不一致.我实际上看到它工作,但只有在设备B(从iCloud填充)几次崩溃后.
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
if (persistentStoreCoordinator != nil)
return persistentStoreCoordinator;
NSURL *legacyStoreUrl = [NSURL fileURLWithPath:[[self applicationDocumentsDirectory] stringByAppendingPathComponent:[self activeStoreFilenameUpgraded:NO]]];
NSURL *upgradedStoreUrl = [NSURL fileURLWithPath:[[self applicationDocumentsDirectory] stringByAppendingPathComponent:[self activeStoreFilenameUpgraded:YES]]];
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if ((IOS_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.0")) && (self.iCloudEnabled)) {
NSPersistentStoreCoordinator* psc = persistentStoreCoordinator;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *cloudOptions = nil;
NSDictionary *localOptions = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
nil];
NSURL *cloudURL = [fileManager URLForUbiquityContainerIdentifier:@"<CONTAINER ID>"];
NSString *coreDataCloudContent = [[cloudURL path] stringByAppendingPathComponent:[NSString stringWithFormat:@"logs%d",[self activeStoreIndex]]];
if ([coreDataCloudContent …Run Code Online (Sandbox Code Playgroud) 我将项目更新为Xcode 5并在构建设置中启用了模块.但是,我Unexpected '@' in program在使用时看到编译器错误@import.
#ifndef __IPHONE_7_0
#warning "This project uses features only available in iOS SDK 7.0 and later."
#endif
#ifdef __cplusplus
#import <opencv2/opencv.hpp>
#endif
#ifdef __OBJC__
@import SystemConfiguration;
@import UIKit;
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还有什么应该做的吗?
objective-c ×5
ios ×4
ios7 ×2
uitableview ×2
addressbook ×1
cllocation ×1
cocoa-touch ×1
core-data ×1
datecell ×1
icloud ×1
ios5 ×1
ios6 ×1
ipad ×1
mkannotation ×1
popover ×1
segue ×1
storyboard ×1
swift ×1
uidatepicker ×1
xcode4 ×1
xcode5 ×1