MARK 开发小细节：
1、pem 转 cer 证书：$ openssl x509 -in 214588721660321.pem -out testcert.cer -outform der
2、url含中文： NSString *encodedURLString = (NSString*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)post_url,(CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]",NULL,kCFStringEncodingUTF8));
3.隐藏状态栏 调用此方法：flag、、隐藏或展示
-（void）dosonme{
if([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
[self prefersStatusBarHidden:flag];
[self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
}
}
-(BOOL)prefersStatusBarHidden:(int)flag
{
returnflag;
}
4、正则切割字符串：
NSString *test = @"1qe#dsadsadas#htt#234#www.badidu.com 我的";
NSString*regexStr =@"(#\\w+#)";//含#qwe#的字符串
NSError*error;
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:regexStr
options:0
error:&error];
NSArray*array = [regexmatchesInString:testoptions:0range:NSMakeRange(0, test.length)];
NSMutableArray *replaceStrS = [[NSMutableArray alloc]initWithCapacity:array.count];
for(NSTextCheckingResult *str2in array)
{
NSString*str = [testsubstringWithRange:str2.range];
[replaceStrSaddObject:str];
LFLog(@"---->%@",str);
}
5、ios调用私有方法：（例子）
/*三方库私有方法*/
- (void)cl_progressSliderTouchBegan:(CLSlider*)slider{
SEL selector = NSSelectorFromString(@"cl_progressSliderTouchBegan:");
((void(*)(id,SEL,id))[self.playerViewmethodForSelector:selector])(self.playerView, selector,slider);
}
6重写私有方法：（例子）
Method oriM =class_getInstanceMethod(_playerView.class,@selector(私有方法));
Method newM =class_getInstanceMethod(self.class,@selector(需要变成的方法));
method_exchangeImplementations(oriM, newM);
7获取属性
unsigned int outCount =0;
Ivar* ivars =class_copyIvarList([_playerView class], &outCount);
for(unsigned int i =0; i < outCount; i ++) {
Ivar ivar = ivars[i];
const char* name =ivar_getName(ivar);
const char* type =ivar_getTypeEncoding(ivar);
NSLog(@"类型为 %s 的 %s ",type, name);
}
free(ivars);
//获取方法
unsignedintmethCount =0;
Method*meths =class_copyMethodList([UITextFieldclass], &methCount);
for(inti =0; i < methCount; i++) {
Methodmeth = meths[i];
SELsel =method_getName(meth);
constchar*name =sel_getName(sel);
NSLog(@"%s", name);
8、通知中心的坑（注意 app完全关闭后 和 后台前台获取方式不一样）
在APP完全被关闭后，收到通知后：
在后台/前台，app未关闭时：
9.数组去重一步搞定
NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];
10. 上线app 用户为ios 9.2.1 下载崩溃
mark：UI切图很关键，不规范图将导致无法安装/出现一安装即崩溃现象，恶心心
解决方法：解压ipa-》终端 -》cd 到(App\ 2018-08-27\ 16-02-21/App/Payload )-》$ find . -name 'Assets.car'-》$ sudo xcrun --sdk iphoneos assetutil --info ./App.app/Assets.car > Assets.json
打开Assets.json 搜索："DisplayGamut" : "P3" ,删除或者重新修改图片
11排序：
取模型中price最小的：
CGFloat minValue = [[_models valueForKeyPath:@"@min.price"] floatValue];
按price排序 YES NO 正序 倒叙
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"price" ascending:YES];
NSArray * tempArr = [self.models sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
排序
NSArray*sortArray = [self.dic.allKeyssortedArrayUsingComparator:^NSComparisonResult(id _Nonnullobj1,id _Nonnullobj2) {
return [obj1 compare:obj2 options:NSNumericSearch];
}];
self.dataArray= [NSMutableArrayarrayWithArray:sortArray];
12好用的URL http://host?query
[url query];
[url host];
获取WiFi名称：需开启定位
NSString *wifiSSID = @""; CFArrayRef wifiInterfaces = CNCopySupportedInterfaces(); NSArray *interfaces = (__bridge NSArray*)wifiInterfaces; for(NSString*interfaceName in interfaces) { CFDictionaryRef dictRef = CNCopyCurrentNetworkInfo((__bridge CFStringRef)(interfaceName)); if(dictRef) { NSDictionary *networkInfo = (__bridge NSDictionary*)dictRef; wifiSSID = [networkInfo objectForKey:(__bridge NSString*)kCNNetworkInfoKeySSID]; CFRelease(dictRef); } } if (interfaces != nil) { CFRelease(wifiInterfaces); } return wifiSSID;
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