iOS常用技术

2023-08-30 10:30:22

0.*

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npm config set disturl https://npm.taobao.org/dist --global

1.判断系统

#define UMSYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

调用方法:

UMSYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0") //高于或等于 iOS8.0的系统

2.关于导航控制器下的高度 (以后整理)

iOS 7 : viewDidLoad中 viewDidAppear:中

iOS 8及以后:viewDidLoad中 viewDidAppear:中

3.用逗号分隔一串数字

 - (void)formatMoney{

     NSInteger moneyNum = ;

     NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];

     formatter.numberStyle = NSNumberFormatterDecimalStyle;

     NSString* formatMoney = [formatter stringFromNumber:[NSNumber numberWithInteger:moneyNum]];

     NSLog(@"%@",formatMoney);

 }

4.nsdictionary的排序

         // 按等级从小到大排序

         NSArray *allKeys = [_dictLevelName allKeys];

         allKeys = [allKeys sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {

             NSString *str1 = (NSString *)obj1;

             NSString *str2 = (NSString *)obj2;

             NSInteger level1 = [str1 integerValue];

             NSInteger level2 = [str2 integerValue];

             return [@(level1) compare:@(level2)];　　// compare:是NSNumber 的函数,不可以比较字符串,需要单独转换.

         }];

         for (NSString *key in allKeys) {

             NSString *name = [_dictLevelName objectForKey:key];

             if (ISSTRING(name)) {

                 [_arrayLevelName addObject:name];

             }

         }

5.NSAssert作用:若程序在此处崩溃,就能在不插入全局断点的情况下,崩在此处,代替全局断点的作用.

NSAssert(view, @"View must not be nil.");崩溃,倒退崩溃到了我的代码

[[PTVConfig instance] showToast:self.superview msg:@"解除屏蔽"];

是在 cell 中调用的,找不到父类 tableview 了,可见尽量少用 superview, 用父类作为代理直接处理.

6.查找最外层的控制器的方法:

UITabBarController *tabBar = (UITabBarController *)[[[[UIApplication sharedApplication] delegate] window] rootViewController];

UINavigationController *navi = tabBar.selectedViewController;

UIViewController *vc = navi.visibleViewController;

7.关于手势

上面的手势对应的操作是：

Tap（点一下）
Pinch（二指往內或往外拨动，平时经常用到的缩放）
Rotation（旋转）
Swipe（滑动，快速移动）
Pan （拖移，慢速移动）
LongPress（长按）

8.运行 gif 图片,可以使用 UIImageView 动画. 代码如下:

 - (void)test {

     self.imgView.animationImages = [self animationImages]; //获取Gif图片列表

     self.imgView.animationDuration = ;     //执行一次完整动画所需的时长

     self.imgView.animationRepeatCount = ;  //动画重复次数

     [self.imgView startAnimating];

 }

 - (NSArray *)animationImages

 {

     NSFileManager *fielM = [NSFileManager defaultManager];

     NSString *path = [[NSBundle mainBundle] pathForResource:@"vip_new_comer_tail" ofType:@"bundle"];

     NSArray *arrays = [fielM contentsOfDirectoryAtPath:path error:nil];

     NSMutableArray *imagesArr = [NSMutableArray array];

     for (NSString *name in arrays) {

         NSString *imagePath = [path stringByAppendingPathComponent:name];

         NSData *data = [NSData dataWithContentsOfFile:imagePath];

         UIImage *image = [UIImage imageWithData:data];

         if (image) {

             [imagesArr addObject:image];

         }

     }

     return imagesArr;

 }

9.对于字符串形式保存的用户配置,若将其转换成字典,可以先使用方法将其转换成 NSData 对象,再将该对象装换成 NSDictionary 对象.

     NSString *conf = [dict objectForKey:@"conf"];

     if (conf) {

         NSData * data = [conf dataUsingEncoding:NSUTF8StringEncoding];

         if (data) {

            NSDictionary *confDict = [NSJSONSerialization JSONObjectWithData:data options: error:nil];

         }

     }

10.若给父视图添加了手势,则子视图UIControl 的点击事件被触发后,会先执行父视图的手势,后执行按钮的事件.

若想阻碍父视图的按钮事件,安静地执行按钮事件,可以在手势的delegate的代理方法中,查看当前用户点击的视图,来确定是否调用父视图的代理方法.

 - (void)viewDidLoad {

     [super viewDidLoad];

     [self setupUI];

 }

 - (void)setupUI{

     UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onViewTouchDonw:)];

     recognizer.delegate = self;

     [self.view addGestureRecognizer:recognizer];

     [self.btn addTarget:self action:@selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];

 }

 -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch

 {

     if([touch.view isKindOfClass:[UIButton class]])

     {

         NSLog(@"啦啦啦---%@",[touch.view class]);

         return NO;

     }

     return YES;

 }

11.判断麦克风和相机使用权限并打开的代码,iOS系统要在 plist 中添加信任的字符串,参考iOS 10 开发适配系列之权限Crash问题- 简书.

 /// 检查相机和麦克风的访问权限并提示设置

 - (BOOL)checkMediaTypeVideoAndAudio{

     BOOL bVideoAuthor = [self checkMediaTypeVideo];

     BOOL bAudioAuthor = [self checkMediaTypeAudio];

     if (bVideoAuthor && bAudioAuthor) {

         return YES;

     } else {

         return NO;

     }

 }

 /// 检查相机的访问权限并提示设置

 - (BOOL)checkMediaTypeVideo{

     __block BOOL bAuthor = NO;

     AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

     if (authStatus == AVAuthorizationStatusNotDetermined ||

         authStatus == AVAuthorizationStatusDenied ){

         // 首次访问照像机权限的时候会弹出允许或不允许的对话框,后来访问失败的话,会在以下 block 中传值为 NO 的参数

         [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {

             if (!granted) {

                 UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:@"请在\"设置－隐私－相机\"选项中，允许熊猫直播访问你的相机" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];

                 [alertView show];

             } else {

                 bAuthor = YES;

             }

         }];

     }

     return bAuthor;

 }

 /// 检查麦克风的访问权限并提示设置

 - (BOOL)checkMediaTypeAudio{

     __block BOOL bAuthor = NO;

     AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];

     if (authStatus == AVAuthorizationStatusNotDetermined ||

         authStatus == AVAuthorizationStatusDenied ) {

         // 首次访问麦克风权限的时候会弹出允许或不允许的对话框,后来访问失败的话,会在以下 block 中传值为 NO 的参数

         [AVCaptureDevice requestAccessForMediaType:AVMediaTypeAudio completionHandler:^(BOOL granted) {

             if (!granted) {

                 UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil message:@"请在\"设置－隐私－麦克风\"选项中，允许熊猫直播访问你的麦克风" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];

                 [alertView show];

             }

         }];

     }

     return bAuthor;

 }

12.YYModel不同变量的使用方法

 + (NSDictionary *)modelCustomPropertyMapper {

     NSMutableDictionary *chatMappers = [@{@"text" : @"data.text",

                                   @"color" : @"data.color",

                                   @"size" : @"data.size",

                                   @"font" : @"data.font",

                                   } mutableCopy];

     NSDictionary *baseMappers = @{@"rid"  : @"from.rid",

                                   @"nick"  : @"from.nick",

                                   @"level"  : @"from.level",

                                   @"fromLevelMin"  : @"from.level_min",

                                   @"fromLevelMax"  : @"from.level_max",

                                   @"exp"  : @"from.exp",

                                   @"roleName"  : @"from.role_name",

                                   @"roleVal" : @"from.role_val",

                                   @"xroomId"  : @"to",

                                   @"type"  : @"type",

                                   };

     [chatMappers addEntriesFromDictionary:baseMappers];

     return chatMappers;

 }

13.YYText 在 cell 中时,获取点击的位置

 - (void)onTapChatMsg:(UITapGestureRecognizer *)tap{

     CGRect rect = self.chatMsgLabel.textLayout.textBoundingRect;

     CGPoint point = [tap locationInView:tap.view];

     if (CGRectContainsPoint(rect, point)) {

         NSLog(@"被点击了");

     }

 }

14.选中某个 cell 的常用代码:

 /// 某个 cell 是否被选中, 在 cellForItemAtIndexPath 代理方法中调用

 - (void)selectedCellIfNeeded:(PXYStickerCollectionViewCell *)cell indexPath:(NSIndexPath *)indexPath

 {

     if (self.lastSelectIndexPath == nil)

     {

         return;

     }

     if(indexPath.item == self.lastSelectIndexPath.item)

     {

         cell.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.4];

         cell.gradientLayer.hidden = YES;

     }

     else

     {

         cell.backgroundColor = [UIColor clearColor];

         cell.gradientLayer.hidden = NO;

     }

 }

 /// 选中某个 cell, 在 didSelectItemAtIndexPath 代理方法中调用

 - (void)selectingIndexPath:(NSIndexPath *)indexPath collectionView:(UICollectionView *)collectionView{

     PXYStickerCollectionViewCell *cell = (PXYStickerCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];

     cell.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.4];

     cell.gradientLayer.hidden = YES;

     if (self.lastSelectIndexPath == nil)

     {

         self.lastSelectIndexPath = indexPath;

         return;

     }

     else if (self.lastSelectIndexPath.item == indexPath.item)

     {

         return;

     }

     PXYStickerCollectionViewCell *lastCell = (PXYStickerCollectionViewCell *)[collectionView cellForItemAtIndexPath:self.lastSelectIndexPath];

     lastCell.backgroundColor = [UIColor clearColor];

     lastCell.gradientLayer.hidden = NO;

     self.lastSelectIndexPath = indexPath;

 }

15.限制输入多少个字符

 - (void)textViewDidChange:(UITextView *)textView{

     NSString *lang = [[UIApplication sharedApplication]textInputMode].primaryLanguage; // 键盘输入模式

     if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入，包括简体拼音，健体五笔，简体手写

         UITextRange *selectedRange = [textView markedTextRange];

         //获取高亮部分

         UITextPosition *position = [textView positionFromPosition:selectedRange.start offset:];

         // 没有高亮选择的字，则对已输入的文字进行字数统计和限制

         if (!position) {

             [self checkTextViewText:textView];

         }

         // 有高亮选择的字符串，则暂不对文字进行统计和限制

         else{

             [self checkTextViewText:textView];

         }

     }

     // 中文输入法以外的直接对其统计限制即可，不考虑其他语种情况

     else{

     }

 }

 - (void)textViewDidEndEditing:(UITextView *)textView{

     [self checkTextViewText:textView];

 }

 - (void)checkTextViewText:(UITextView *)textView {

     if (textView.text.length > kMaxInputWindPlaneEditView) {

         textView.text = [textView.text substringToIndex:kMaxInputWindPlaneEditView];

         [[PTVConfig instance] showToast:self msg:[NSString stringWithFormat:@"文字长度不能超过%li个字符",(long)kMaxInputWindPlaneEditView]];

     }

 }

16.把崩溃日志转化为具体的某一行(crash 崩溃)(参考http://www.jianshu.com/p/da186c14db0f)

(/Users/liuzhu/Library/Developer/Xcode/DerivedData/xxx-atouolfjhjicfrgglhmhmicssual/Build/Products 中含有 dsym 文件)

 chmod +x symbolicatecrash

  export DEVELOPER_DIR="/Applications/XCode.app/Contents/Developer"

 ./symbolicatecrash .crash PandaTV-ios.app.dSYM > Control_symbol.crash

(PS:Xcode7.3 symbolicatecrash路径
/Applications/Xcode.app/Contents/SharedFrameworks/DVTFoundation.framework/Versions/A/Resources/symbolicatecrash)

17.在分类中添加属性,核心代码如下:

 #import <objc/runtime.h>

 @property (nonatomic,assign) CGFloat count;

 -(void)setCount:(CGFloat)count{

     objc_setAssociatedObject(self, @selector(count), @(count), OBJC_ASSOCIATION_RETAIN_NONATOMIC);

 }

 -(CGFloat)count{

     NSNumber *count = objc_getAssociatedObject(self, @selector(count));

     return count.floatValue;

 }

18.若 UIScrollView 的尺寸随着其中的图片尺寸在变化,则可以设置UIViewController中的automaticallyAdjustsScrollViewInsets属性来让其不变

 - (void)viewDidLoad {

     [super viewDidLoad];

     [self setAutomaticallyAdjustsScrollViewInsets:NO];

 }

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