只是随笔, 若有不知所云处, 敬请忽略.
- 关于NSInvocation
> 1. 创建一个MethodSignature，签名中保存了方法的名称，参数和返回值
//这个方法属于谁，那么就用谁来进行创建
//注意：签名一般是用来设置参数和获得返回值的，和方法的调用没有太大的关系
NSMethodSignature *signature = [ViewController instanceMethodSignatureForSelector:@selector(callWithNumber:andContext:withStatus:)];
> 2. 通过MethodSignature来创建一个NSInvocation
//NSInvocation中保存了方法所属于的对象|方法名称|参数|返回值等等
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:signature];
> 2.1 设置invocation，来调用方法
invocation.target = self;
// invocation.selector = @selector(call);
// invocation.selector = @selector(callWithNumber:);
// invocation.selector = @selector(callWithNumber:andContext:);
invocation.selector = @selector(callWithNumber:andContext:withStatus:);
NSString *number = @"10086";
NSString *context = @"下课了";
NSString *status = @"睡觉的时候";
//注意：
//1.自定义的参数索引从2开始，0和1已经被self and _cmd占用了
//2.方法签名中保存的方法名称必须和调用的名称一致
[invocation setArgument:&number atIndex:2];
[invocation setArgument:&context atIndex:3];
[invocation setArgument:&status atIndex:4];
/3.调用invok方法来执行/
[invocation invoke];
2.NSJSONReadingMutableContainers 返回一个可变对象.
NSDictionary *pushBody = [NSJSONSerialization JSONObjectWithData:[pushBodyString dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingMutableContainers error:nil];
3.系统版本适配宏
#define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
4.设置图片的UIImageRenderingMode可以将tintColor的颜色覆盖到图片上。
imageVoice.image = UIImage(named: "icon_voice02.png" )!.imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)
5.设置后台运行任务
- (void)applicationDidEnterBackground:(UIApplication *)application {
UIApplication *app = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier bgTask;
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(),^{
if (bgTask != UIBackgroundTaskInvalid) {
bgTask = UIBackgroundTaskInvalid;
}
});
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask != UIBackgroundTaskInvalid){
bgTask = UIBackgroundTaskInvalid;
}
});
});
}
6.关于cocoapods报错
错误信息:
/Library/Ruby/Site/2.0.0/rubygems/dependency.rb:308:in `to_specs': Could not find 'cocoapods' (>= 0) among 35 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/qinengwanwei/.gem/ruby/2.0.0:/Library/Ruby/Gems/2.0.0:/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0', execute `gem env` for more information
from /Library/Ruby/Site/2.0.0/rubygems/dependency.rb:320:in `to_spec'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_gem.rb:65:in `gem'
from /usr/local/bin/pod:22:in `<main>'
解决方法:
& sudo gem install -n /usr/local/bin cocoapods
7.关于app多次审核不通过, 遇见的一个问题
由于app做了多语言适配, 每个语言中都会自动生成与当前主语言中相同的配图和描述信息等.
当app版本更新时, 也需要一同将多个语言下的配图信息及描述信息更改掉.
8.数组遍历报错
错误信息:
Collection <__NSArrayM> was mutated while being enumerated
错误代码:
for (BBTStationParcelScanOrderInfoModel *model in self.orderInfoModels) {
if (![courierListData.expressInfoModel.expressCode isEqualToString:model.expressCode]) {
[self.orderInfoModels addObject:courierListData.expressInfoModel];
}
}
正确代码:
NSMutableArray *arrM = [NSMutableArray arrayWithArray:self.orderInfoModels];
for (BBTStationParcelScanOrderInfoModel *model in self.orderInfoModels) {
if (![courierListData.expressInfoModel.expressCode isEqualToString:model.expressCode]) {
[self.orderInfoModels addObject:courierListData.expressInfoModel];
}
}
原因:
因为你在你遍历的数组的循环中更改了你遍历的数组的元素的个数,使得系统不知道遍历了几次了,遍历到哪了,所以报错;这时需要一个新的数组来中转一下;
9.UITextField相关位置改变的方法
- (CGRect)borderRectForBounds:(CGRect)bounds;
- (CGRect)textRectForBounds:(CGRect)bounds;
- (CGRect)placeholderRectForBounds:(CGRect)bounds;
- (CGRect)editingRectForBounds:(CGRect)bounds;
- (CGRect)clearButtonRectForBounds:(CGRect)bounds;
- (CGRect)leftViewRectForBounds:(CGRect)bounds;
- (CGRect)rightViewRectForBounds:(CGRect)bounds;
10.jeckines问题
1. BundelID 冲突,在packaging中修改 BundelID.
2. 在此目录中删除杂乱证书: ~/Library/MobileDevice/Provisioning Profiles/
重新生成
3. 关于ResourceRules.plist can not read问题:
Click on your project > Targets > Select your target > Build Settings >
Code Signing Resource Rules Path
and add :
ip
12.去除警告"ld: warning: directory not found for option"
1. 选择 Build Settings
2. 查找 Library Search Paths 和 Framework Search Paths
3. 删除报错路径.
13.关于加载自定义字体.
1. 下载所需的ttf格式字体.
2. 导入工程
3. 在info.plist中添加Fonts provided by application,填写字体文件名称加后缀
4. 在TARGETS -> Build Phases -> Copy Bundle Resources中添加字体文件
5. 因文件名与字体名可能不同,所以需要循环打印所有字体名称,找出添加的字体
NSArray *familyNames = [UIFont familyNames];
for( NSString *familyName in familyNames )
{
NSArray *fontNames = [UIFont fontNamesForFamilyName:familyName];
for( NSString *fontName in fontNames )
{
printf( "\tFont: %s \n", [fontName UTF8String] );
}
}
14.新工作配置新环境之Charles - Response中文乱码
1. 右键Charles.app -> 显示包内容
2. 打开`info.plist` -> 找到`字典Java`中Key值为`VMOptions`的元素
3. 将`value`改为`-Xmx256m -Dfile.encoding=UTF-8`
4. 重启Charles. 完事.
16.富文本 数字比汉子高一点. 解决方法
[attributeStr addAttribute:NSBaselineOffsetAttributeName value:@(kStationAssignedNumberLabelAttrebuteMargin) range:rangeUnit];
17.关于时间格式转换.
//例如
NSString *str = @"May 27, 2016 1:37:04 PM";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//输入格式
[dateFormatter setDateFormat:@"MMM dd,yyyy K:mm:ss aa"];
dateFormatter.locale = [[NSLocale alloc]initWithLocaleIdentifier:@"es_US"];
NSDate *detaildate=[dateFormatter dateFromString:str];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *time = [dateFormatter stringFromDate:detaildate];
NSLog(@"%@", time);
18.犯了个低级错误, 错误信息 Tried to pop to a view controller that doesn't exist.
错误原因是在`nav`做`pop`操作时创建了个新的控制器.....而没有pop到栈中的控制器.
19.当更改superView的frame时，在有些情况下subViews的frame也发生了变化。这种情况并不一定都是自己想要的。解决方法如下：
[superView setAutoresizesSubviews:NO];
20.Xcode编译错误:
Warning: no rule to process file '' of type ## for architecture arm64
* 在`Build Phases`中的`Compile Sources`里删除相应文件即可.
21.Xcode编译错误:
ld: warning: directory not found for option '-F~
* 打开`Build Setting`
* 查找`Library Search Paths`
* 删除报错目录
23.打包之后下载dSYMs文件,提示There are no dSYMs available for download.
* `Build Settings -> Build Options -> Debug Information Format`中， 置为了 DWARF，如果选为DWARF则不会产生dSYM文件，必须选择DWARF with dSYM File. 但我没成功...
24.遇见个证书导不出p12问题.
* 打开 `钥匙串`
* 点击 `登录`
* 点击 `我的证书`
* 将在app开发官网上下载的证书拖进去
* 右键导出.
25.由于版本调试需要,下载了Xcode6.4来使用iOS8.3系统的模拟器调试.
但是启用模拟器时报错.说未找到一个liblaunch_sim.dylib的库文件. 解决方法如下:
一、找到目标文件
/Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/system/host/liblaunch_sim.dylib
二、拷贝到目标地址一和目标地址二。
目标地址一
/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 8.1.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib
目标地址二
/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 8.2.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/host/liblaunch_sim.dylib
26.子视图的alpha不能高于父视图,但有时遮罩或者其他需求 需要子视图的alpha高于父视图, 解决方法:
`superView.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.5];`
27.在Instruments中需要真机的调试工具中, 可能出现真机不能点击的问题,解决原因及方法:
可能由于手机版本过低, 而项目的版本号过高.
将项目的版本号调低即可.
28.Xcode 非ARC下使用__weak会报错; 在哪也看到一个 Xocde7.3解决自动联想, 好似也是下述步骤, 但没测过, 有兴趣的可以试试.
> 1. 点击target
> 2. 进入build setting
> 3. 搜索Weak References In Manual Retain Release
> 4. 改成YES;