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细节（一）

發布時間：2024/8/1 编程问答 34 豆豆

生活随笔收集整理的這篇文章主要介紹了细节（一）小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

1、禁止手機睡眠

[UIApplication sharedApplication].idleTimerDisabled = YES;

2、隱藏某行cell

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { // 如果是你需要隱藏的那一行，返回高度為0if(indexPath.row == YouWantToHideRow)return 0; return 44; }// 然后再你需要隱藏cell的時候調用 [self.tableView beginUpdates]; [self.tableView endUpdates];

3、禁用button高亮

button.adjustsImageWhenHighlighted = NO; 或者在創建的時候UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

4、tableview遇到這種報錯failed to obtain a cell from its dataSource

是因為你的cell被調用的早了。先循環使用了cell，后又創建cell。順序錯了
可能原因：1、xib的cell沒有注冊 2、內存中已經有這個cell的緩存了(也就是說通過你的cellId找到的cell并不是你想要的類型)，這時候需要改下cell的標識

5、cocoa pods報這個錯誤：unable to access 'https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received

解決辦法：原因可能是網絡問題，網絡請求超時了，只需要重試就行了

6、cocoa pods 出現ERROR: While executing gem ... (Errno::EPERM)

解決辦法：
https://segmentfault.com/q/1010000002926243

7、動畫切換window的根控制器

// options是動畫選項 [UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{BOOL oldState = [UIView areAnimationsEnabled];[UIView setAnimationsEnabled:NO];[UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController new];[UIView setAnimationsEnabled:oldState];} completion:^(BOOL finished) {}];

8、去除數組中重復的對象

NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];

9、編譯的時候遇到?no such file or directory: ／users／apple／XXX

是因為編譯的時候，在此路徑下找不到這個文件，解決這個問題，首先是是要檢查缺少的文件是不是在工程中，如果不在工程中，需要從本地拖進去，如果發現已經存在工程中了，或者拖進去還是報錯，這時候需要去build phases中搜索這個文件，這時候很可能會搜出現兩個相同的文件，這時候，有一個路徑是正確的，刪除另外一個即可。如果刪除了還是不行，需要把兩個都刪掉，然后重新往工程里拖進這個文件即可

build phases

10、iOS8系統中，tableView最好實現下-tableView: heightForRowAtIndexPath:這個代理方法，要不然在iOS8中可能就會出現顯示不全或者無法響應事件的問題

11、iOS8中實現側滑功能的時候這個方法必須實現，要不然在iOS8中無法側滑

// 必須寫的方法，和editActionsForRowAtIndexPath配對使用，里面什么不寫也行 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {}

12、三個通知

NSSystemTimeZoneDidChangeNotification監聽修改時間界面的兩個按鈕狀態變化
UIApplicationSignificantTimeChangeNotification 監聽用戶改變時間（只要點擊自動設置按鈕就會調用） NSSystemClockDidChangeNotification 監聽用戶修改時間（時間不同才會調用）

13、SDWebImage本地緩存有時候會害人。如果之前緩存過一張圖片，即使下次服務器換了這張圖片，但是圖片url沒換，用sdwebimage下載下來的還是以前那張,所以遇到這種問題，不要先去懟服務器，清空下緩存再試就好了。

14、上線前注意：

1）、刪掉代碼中所有的測試代碼
2）、如果后臺有審核模式，提醒后臺開啟此模式
3）、主流程再跑一跑
4）、全局搜索waring，檢查所有標記waring的地方

15、跳進app權限設置

// 跳進app設置if (UIApplicationOpenSettingsURLString != NULL) {NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];[[UIApplication sharedApplication] openURL:url];}}

16、給一個view截圖

UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);[view.layer renderInContext:UIGraphicsGetCurrentContext()];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();

17、開發中如果要動態修改tableView的tableHeaderView或者tableFooterView的高度，需要給tableView重新設置，而不是直接更改高度。正確的做法是重新設置一下tableView.tableFooterView = 更改過高度的view。為什么？其實在iOS8以上直接改高度是沒有問題的，在iOS8中出現了contentSize不準確的問題，這是解決辦法。

18、注意對象為nil的時候，調用此對象分類的方法不會執行

19、collectionView的內容小于其寬高的時候是不能滾動的，設置可以滾動：

collectionView.alwaysBounceHorizontal = YES; collectionView.alwaysBounceVertical = YES;

20、設置navigationBar上的title顏色和大小

[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]

21、顏色轉圖片

+ (UIImage *)cl_imageWithColor:(UIColor *)color {CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);UIGraphicsBeginImageContext(rect.size);CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetFillColorWithColor(context, [color CGColor]);CGContextFillRect(context, rect);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image; }

22、view設置圓角

#define ViewBorderRadius(View, Radius, Width, Color)\ \ [View.layer setCornerRadius:(Radius)];\ [View.layer setMasksToBounds:YES];\ [View.layer setBorderWidth:(Width)];\ [View.layer setBorderColor:[Color CGColor]] // view圓角

23、強／弱引用

#define WeakSelf(type) __weak typeof(type) weak##type = type; // weak #define StrongSelf(type) __strong typeof(type) type = weak##type; // strong

24、由角度轉換弧度

#define DegreesToRadian(x) (M_PI * (x) / 180.0)

25、由弧度轉換角度

#define RadianToDegrees(radian) (radian*180.0)/(M_PI)

26、獲取圖片資源

#define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

27、獲取temp

#define PathTemp NSTemporaryDirectory()

28、獲取沙盒 Document

#define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]

29、獲取沙盒 Cache

#define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

30、GCD代碼只執行一次

#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);

31、自定義NSLog

#ifdef DEBUG #define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__) #else #define NSLog(...) #endif

32、Font

#define FontL(s) [UIFont systemFontOfSize:s weight:UIFontWeightLight] #define FontR(s) [UIFont systemFontOfSize:s weight:UIFontWeightRegular] #define FontB(s) [UIFont systemFontOfSize:s weight:UIFontWeightBold] #define FontT(s) [UIFont systemFontOfSize:s weight:UIFontWeightThin] #define Font(s) FontL(s)

33、FORMAT

#define FORMAT(f, ...) [NSString stringWithFormat:f, ## __VA_ARGS__]

34、在主線程上運行

#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);

35、開啟異步線程

#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);

36、通知

#define NOTIF_ADD(n, f) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil] #define NOTIF_POST(n, o) [[NSNotificationCenter defaultCenter] postNotificationName:n object:o] #define NOTIF_REMV() [[NSNotificationCenter defaultCenter] removeObserver:self]

37、隨機顏色

+ (UIColor *)RandomColor {NSInteger aRedValue = arc4random() % 255;NSInteger aGreenValue = arc4random() % 255;NSInteger aBlueValue = arc4random() % 255;UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];return randColor; }

38、獲取window

+(UIWindow*)getWindow {UIWindow* win = nil; //[UIApplication sharedApplication].keyWindow;for (id item in [UIApplication sharedApplication].windows) {if ([item class] == [UIWindow class]) {if (!((UIWindow*)item).hidden) {win = item;break;}}}return win; }

39、修改textField的placeholder的字體顏色、大小

[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"]; [textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];

40、統一收起鍵盤

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

41、控制屏幕旋轉，在控制器中寫

- (BOOL)shouldAutorotate {return YES; }- (UIInterfaceOrientationMask)supportedInterfaceOrientations {return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight; }- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight; }

42、獲取app緩存大小

- (CGFloat)getCachSize {NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];//獲取自定義緩存大小//用枚舉器遍歷一個文件夾的內容//1.獲取文件夾枚舉器NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];__block NSUInteger count = 0;//2.遍歷for (NSString *fileName in enumerator) {NSString *path = [myCachePath stringByAppendingPathComponent:fileName];NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];count += fileDict.fileSize;//自定義所有緩存大小}// 得到是字節轉化為MCGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;return totalSize; }

43、清理app緩存

- (void)handleClearView {//刪除兩部分//1.刪除 sd 圖片緩存//先清除內存中的圖片緩存[[SDImageCache sharedImageCache] clearMemory];//清除磁盤的緩存[[SDImageCache sharedImageCache] clearDisk];//2.刪除自己緩存NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];[[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil]; }

44、模型轉字典

static NSSet *classes;- (NSMutableDictionary *)getParameterDictionary {NSMutableDictionary *dict = [NSMutableDictionary dictionary];Class c = self.class;while (c) {unsigned count;objc_property_t *properties = class_copyPropertyList([c class], &count);for (int i = 0; i < count; i++) {NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];dict[key] = [self valueForKey:key];}free(properties);// 獲得父類c = class_getSuperclass(c);if ([self isClassFromFoundation:c]) break;}return dict; }- (BOOL)isClassFromFoundation:(Class)c {if (c == [NSObject class] || c == [NSManagedObject class]) return YES;__block BOOL result = NO;[[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {if ([c isSubclassOfClass:foundationClass]) {result = YES;*stop = YES;}}];return result; }- (NSSet *)foundationClasses {if (classes == nil) {// 集合中沒有NSObject，因為幾乎所有的類都是繼承自NSObject，具體是不是NSObject需要特殊判斷classes = [NSSet setWithObjects:[NSURL class],[NSDate class],[NSValue class],[NSData class],[NSError class],[NSArray class],[NSDictionary class],[NSString class],[NSAttributedString class], nil];}return classes; }

45、交換兩個方法實現

Class aClass = [self class]; SEL originalSelector = @selector(viewWillAppear:); SEL swizzledSelector = @selector(xxx_viewWillAppear:); Method originalMethod = class_getInstanceMethod(aClass, originalSelector); Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector); BOOL didAddMethod = class_addMethod(aClass, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod)); if (didAddMethod) { class_replaceMethod(aClass, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod)); } else { method_exchangeImplementations(originalMethod, swizzledMethod); }

46、打印百分號和引號

NSLog(@"%%");NSLog(@""");

47、幾個常用權限判斷

if ([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {NSLog(@"沒有定位權限");}AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];if (statusVideo == AVAuthorizationStatusDenied) {NSLog(@"沒有攝像頭權限");}//是否有麥克風權限AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];if (statusAudio == AVAuthorizationStatusDenied) {NSLog(@"沒有錄音權限");}[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {if (status == PHAuthorizationStatusDenied) {NSLog(@"沒有相冊權限");}}];

48、獲取手機型號

+ (NSString *)getDeviceInfo {struct utsname systemInfo;uname(&systemInfo);NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";// 日行兩款手機型號均為日本獨占，可能使用索尼FeliCa支付方案而不是蘋果支付if ([platform isEqualToString:@"iPhone9,1"]) return @"國行、日版、港行iPhone 7";if ([platform isEqualToString:@"iPhone9,2"]) return @"港行、國行iPhone 7 Plus";if ([platform isEqualToString:@"iPhone9,3"]) return @"美版、臺版iPhone 7";if ([platform isEqualToString:@"iPhone9,4"]) return @"美版、臺版iPhone 7 Plus";if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";if ([platform isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";if ([platform isEqualToString:@"iPod5,1"]) return @"iPod Touch 5G";if ([platform isEqualToString:@"iPad1,1"]) return @"iPad 1G";if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2";if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2";if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2";if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2";if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini 1G";if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini 1G";if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini 1G";if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3";if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3";if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3";if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4";if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4";if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4";if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air";if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air";if ([platform isEqualToString:@"iPad4,3"]) return @"iPad Air";if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini 2G";if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini 2G";if ([platform isEqualToString:@"iPad4,6"]) return @"iPad Mini 2G";if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";if ([platform isEqualToString:@"x86_64"]) return @"iPhone Simulator";return platform; }

49、長按復制功能

- (void)viewDidLoad {[self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]]; } - (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {if (longPress.state == UIGestureRecognizerStateBegan) {UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];pasteboard.string = @"需要復制的文本";} }

50、cocoapods升級

在終端執行 sudo gem install -n / usr / local / bin cocoapods --pre

51、設置啟動頁后，依然顯示之前的

刪除app，手機重啟，重新安裝

52、判斷圖片類型

//通過圖片Data數據第一個字節來獲取圖片擴展名 - (NSString *)contentTypeForImageData:(NSData *)data {uint8_t c;[data getBytes:&c length:1];switch (c){case 0xFF:return @"jpeg";case 0x89:return @"png";case 0x47:return @"gif";case 0x49:case 0x4D:return @"tiff";case 0x52:if ([data length] < 12) {return nil;}NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];if ([testString hasPrefix:@"RIFF"]&& [testString hasSuffix:@"WEBP"]){return @"webp";}return nil;}return nil; }

53、獲取手機和app信息

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary]; CFShow(infoDictionary); // app名稱 NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"]; // app版本 NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"]; // app build版本 NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"]; //手機序列號 NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier]; NSLog(@"手機序列號: %@",identifierNumber); //手機別名：用戶定義的名稱 NSString* userPhoneName = [[UIDevice currentDevice] name]; NSLog(@"手機別名: %@", userPhoneName); //設備名稱 NSString* deviceName = [[UIDevice currentDevice] systemName]; NSLog(@"設備名稱: %@",deviceName ); //手機系統版本 NSString* phoneVersion = [[UIDevice currentDevice] systemVersion]; NSLog(@"手機系統版本: %@", phoneVersion); //手機型號 NSString* phoneModel = [[UIDevice currentDevice] model]; NSLog(@"手機型號: %@",phoneModel ); //地方型號（國際化區域名稱） NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel]; NSLog(@"國際化區域名稱: %@",localPhoneModel ); NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary]; // 當前應用名稱 NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"]; NSLog(@"當前應用名稱：%@",appCurName); // 當前應用軟件版本比如：1.0.1 NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"]; NSLog(@"當前應用軟件版本:%@",appCurVersion); // 當前應用版本號碼 int類型 NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"]; NSLog(@"當前應用版本號碼：%@",appCurVersionNum);

54、獲取一個類的所有屬性

id LenderClass = objc_getClass("Lender"); unsigned int outCount, i; objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount); for (i = 0; i < outCount; i++) {objc_property_t property = properties[i];fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property)); }

55、image圓角

- (UIImage *)circleImage {// NO代表透明UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);// 獲得上下文CGContextRef ctx = UIGraphicsGetCurrentContext();// 添加一個圓CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);// 方形變圓形CGContextAddEllipseInRect(ctx, rect);// 裁剪CGContextClip(ctx);// 將圖片畫上去[self drawInRect:rect];UIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image; }

56、image拉伸

+ (UIImage *)resizableImage:(NSString *)imageName {UIImage *image = [UIImage imageNamed:imageName];CGFloat imageW = image.size.width;CGFloat imageH = image.size.height;return [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch]; }

57、JSON字符串轉字典

+ (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];return responseJSON; }

58、身份證號驗證

- (BOOL)validateIdentityCard {BOOL flag;if (self.length <= 0) {flag = NO;return flag;}NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];return [identityCardPredicate evaluateWithObject:self]; }

59、獲取設備mac地址

+ (NSString *)macAddress {int mib[6];size_t len;char *buf;unsigned char *ptr;struct if_msghdr *ifm;struct sockaddr_dl *sdl;mib[0] = CTL_NET;mib[1] = AF_ROUTE;mib[2] = 0;mib[3] = AF_LINK;mib[4] = NET_RT_IFLIST;if((mib[5] = if_nametoindex("en0")) == 0) {printf("Error: if_nametoindex error\n");return NULL;}if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {printf("Error: sysctl, take 1\n");return NULL;}if((buf = malloc(len)) == NULL) {printf("Could not allocate memory. Rrror!\n");return NULL;}if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {printf("Error: sysctl, take 2");return NULL;}ifm = (struct if_msghdr *)buf;sdl = (struct sockaddr_dl *)(ifm + 1);ptr = (unsigned char *)LLADDR(sdl);NSString *outstring = [NSString stringWithFormat:@"X:X:X:X:X:X",*ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];free(buf);return outstring; }

60、導入自定義字體庫

1、找到你想用的字體的 ttf 格式，拖入工程
2、在工程的plist中增加一行數組，“Fonts provided by application”
3、為這個key添加一個item，value為你剛才導入的ttf文件名
4、直接使用即可：label.font = [UIFont fontWithName:@"你剛才導入的ttf文件名" size:20.0]；

61、拿到當前正在顯示的控制器，不管是push進去的，還是present進去的都能拿到

- (UIViewController *)getVisibleViewControllerFrom:(UIViewController*)vc {if ([vc isKindOfClass:[UINavigationController class]]) {return [self getVisibleViewControllerFrom:[((UINavigationController*) vc) visibleViewController]];}else if ([vc isKindOfClass:[UITabBarController class]]){return [self getVisibleViewControllerFrom:[((UITabBarController*) vc) selectedViewController]];} else {if (vc.presentedViewController) {return [self getVisibleViewControllerFrom:vc.presentedViewController];} else {return vc;}} }

62、runtime為一個類動態添加屬性

// 動態添加屬性的本質是: 讓對象的某個屬性與值產生關聯objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

63、獲取runtime為一個類動態添加的屬性

objc_getAssociatedObject(self, WZBPlaceholderViewKey);

64、KVO監聽某個對象的屬性

// 添加監聽者 [self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];// 當監聽的屬性值變化的時候會來到這個方法 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {if ([keyPath isEqualToString:@"property"]) {[self textViewTextChange];} else {} }

65、Reachability判斷網絡狀態

NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];if (status == NotReachable) {NSLog(@"當前設備無網絡");}if (status == ReachableViaWiFi) {NSLog(@"當前wifi網絡");}if (status == ReachableViaWWAN) {NSLog(@"當前蜂窩移動網絡");}

66、AFNetworking監聽網絡狀態

// 監聽網絡狀況AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];[mgr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {switch (status) {case AFNetworkReachabilityStatusUnknown:break;case AFNetworkReachabilityStatusNotReachable: {[SVProgressHUD showInfoWithStatus:@"當前設備無網絡"];}break;case AFNetworkReachabilityStatusReachableViaWiFi:[SVProgressHUD showInfoWithStatus:@"當前Wi-Fi網絡"];break;case AFNetworkReachabilityStatusReachableViaWWAN:[SVProgressHUD showInfoWithStatus:@"當前蜂窩移動網絡"];break; default:break;}}];[mgr startMonitoring];

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