众所周知,如果iOS应用程序正在运行前台,那么应用程序将不会在删除通知到来时通知用户.现在在我的应用程序中,我想显示警告以通知用户远程通知到来.如何判断应用程序是运行前台还是后台?我找到了docs并搜索了stackoverflow.com,却找不到任何相关内容.谢谢.
为了在通话后返回app,我使用telprompt而不是tel.像这样的代码:
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"telprompt://10086"]];
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有人说它会被苹果拒绝,因为telpromt不是公共URL方案.但我没有找到某个答案 - 是或否.有人可以帮助我吗?
当我向sqlite数据库文件中插入太多数据时,会发生错误"复合SELECT中的术语过多".我用" insert into ... select ... union select ... union ...".我知道它有太多的select语句,但我的问题是:复合SELECT语句中的最大术语数是多少?
当我在键盘显示时尝试显示MBProgressHUD时,我使用下面的代码,但HUD对象无法覆盖键盘:
SNSSharerAppDelegate *delegate = [[UIApplication sharedApplication] delegate];
HUD = [[MBProgressHUD showHUDAddedTo:delegate.window animated:YES] retain];
HUD.mode = MBProgressHUDModeIndeterminate;
HUD.labelText = @"Posting...";
[HUD show:YES];
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我认为HUD对象显示在委托窗口的前面,键盘也显示,所以最后添加了,这是前面的.我错了吗?
我的问题是这样的:重新排序UITableView而没有重新排序控制,我使用这些方法:
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
return UITableViewCellEditingStyleNone;
}
- (BOOL)tableView:(UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath {
return NO;
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath{
}
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和
[self.tableView setEditing:YES];
......
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
ItemTableViewCell *cell = (ItemTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ItemTableViewCell" …Run Code Online (Sandbox Code Playgroud) 颤振版本:
flutter_macos_v1.9.1+hotfix.2-stable
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在终端中创建新项目:
flutter create myapp
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打开vscode,编辑pubspec.yaml:
dependencies:
json_annotation: ^3.0.0
dev_dependencies:
build_runner: ^1.7.0
json_serializable: ^3.2.2
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在终端中获取软件包:
flutter pub get
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新的/lib/user.dart和下面的填充:
import 'package:json_annotation/json_annotation.dart';
part 'user.g.dart';
@JsonSerializable()
class User extends Object {
@JsonKey(name: 'seed')
String seed;
@JsonKey(name: 'results')
int results;
@JsonKey(name: 'page')
int page;
@JsonKey(name: 'version')
String version;
User(
this.seed,
this.results,
this.page,
this.version,
);
factory User.fromJson(Map<String, dynamic> srcJson) =>
_$UserFromJson(srcJson);
Map<String, dynamic> toJson() => _$UserToJson(this);
}
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flutter pub run build_runner build在终端中运行:
[INFO] Generating build script...
[INFO] Generating …Run Code Online (Sandbox Code Playgroud) 当我[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];用来注册远程推送通知时,发生错误说cannot initialize a parameter of type 'UIRemoteNotificationType' with an rvalue of type 'int',有人知道为什么吗?谢谢.
我的项目环境:Xcode 4.2 + iOS 5.
当我使用iOS蓝牙时,代码如下:
static NSString * const kServiceUUID = @"1802";
[self.manager scanForPeripheralsWithServices:@[ [CBUUID UUIDWithString:kServiceUUID] ] options:@{CBCentralManagerScanOptionAllowDuplicatesKey : @NO }];
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为什么没有回应?我在方法scanForPeripheralsWithServices中尝试了各种参数对我已经检查了这个问题: 如何获取可用蓝牙设备的列表?
我的设备是iOS 6的iPod touch 5(越狱).我已经测试了一些蓝牙4.0设备.谁能告诉我为什么?
我已经搜索过并且已经完成了可以播放MIDI音符的OS X应用程序,但是当我在iOS中尝试时,什么都没发生.这是核心代码:
AUGraph graph;
AudioUnit synthUnit;
AUNode synthNode, outNode;
NewAUGraph(&graph);
AudioComponentDescription cd;
cd.componentManufacturer = kAudioUnitManufacturer_Apple;
cd.componentType = kAudioUnitType_MusicDevice;
cd.componentSubType = kAudioUnitSubType_MIDISynth;
AUGraphAddNode(graph, &cd, &synthNode);
cd.componentType = kAudioUnitType_Output;
cd.componentSubType = kAudioUnitSubType_GenericOutput;
AUGraphAddNode(graph, &cd, &outNode), "AUGraphAddNode");
CheckError(AUGraphOpen(graph), "AUGraphOpen");
AUGraphConnectNodeInput(graph, synthNode, 0, outNode, 0);
AUGraphNodeInfo(graph, synthNode, 0, &synthUnit);
AUGraphInitialize(graph);
CAShow(graph);
AUGraphStart(graph);
CFURLRef bankURL = ... //gs_instruments.dls
AudioUnitSetProperty(synthUnit,
kMusicDeviceProperty_SoundBankURL,
kAudioUnitScope_Global,
0,
&bankURL,
sizeof(bankURL));
static UInt32 kChannelMessage_NoteOn = 0x90;
UInt8 channel = 0;
UInt8 note = 60;
UInt32 velocity = 127;
MusicDeviceMIDIEvent(synthUnit,
kChannelMessage_NoteOn | channel, …Run Code Online (Sandbox Code Playgroud) 在Xcode 4中,我未能找到设置UITableViewCell标识符的位置,有人可以帮助我吗?非常感谢你.
环境:OS X 10.9.3, Xcode 5.1, PJSIP-2.2.1 我想搭建一个简单的PJSIP,shell脚本如下:
#!/bin/bash
SOURCE="pjproject-2.2.1"
CONFIG="pjlib/include/pj/config_site.h"
if [ ! -r $SOURCE ]; then
echo 'PJSIP source not found. Trying to untar...'
tar -xjf $SOURCE.tar.bz2
fi
cd $SOURCE
touch $CONFIG
echo > $CONFIG
echo "#define PJ_CONFIG_IPHONE 1" >> $CONFIG
echo "#include <pj/config_site_sample.h>" >> $CONFIG
./configure-iphone
#make dep && make clean && make
echo Done.
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它运行正常并创建了 .a 文件,例如pjlib/lib/libpj-arm-apple-darwin9. 但是,当我用它们来我的iOS项目,它失败了Endianness must be declared for this processor,PJ_IS_LITTLE_ENDIAN is not defined!,PJ_IS_BIG_ENDIAN is not defined! …
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build ×1
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