ios 项目中常遇到的问题 持续更新中···

1、Button 设置圆角 边框问题

#define btnColor          COLOR(225, 99, 102, 1)
self.plateBtn.layer.masksToBounds = YES;
self.plateBtn.layer.cornerRadius = 3;
self.plateBtn.layer.borderWidth = 1;
self.plateBtn.layer.borderColor = btnColor.CGColor;

2、NavigationController 跳转至指定界面

    NSArray *temArray = self.navigationController.viewControllers;
     for(UIViewController *temVC in temArray)
          {
           if ([temVC isKindOfClass:[MyCarViewController class]])
             {
             [self.navigationController popToViewController:temVC animated:YES];
              }
          }
    或者  [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:i] animated:YES];

3、UILabel或UIButton标题 添加下划线

 UILabel添加下划线：
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 120, 50)];
[label setLineBreakMode:NSLineBreakByWordWrapping];
[label setFont:[UIFont systemFontOfSize:13]];
NSMutableAttributedString *content = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"XXXXXX"]];
NSRange contentRange = {0,[content length]};
[content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];
label.attributedText = content;
[self.view addSubview:label];

UIButton 添加下划线：
  self.exmpBtn.frame=CGRectMake(100,100 ,120,50);
NSMutableAttributedString *title = [[NSMutableAttributedString alloc] initWithString:@"示例"];
NSRange titleRange = {0,[title length]};
[title addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:titleRange];
[self.exmpBtn setAttributedTitle:title
                  forState:UIControlStateNormal];

4、判断两个CGSize 是否长和宽都相等

    CGSizeEqualToSize(size0, size1);//分别判断长跟宽是否相等 相等返回YES
       例如：判断某个View 的Size是否为0 
    CGSizeEqualToSize(self.menuViewSize, CGSizeZero) 
    相似的还有 
    CGPointEqualToPoint(point0, point1)；//判断两个点的x,y轴是否相等

5、CocoaPods最新Podfile 添加新库格式

 platform :ios, ‘8.0’
 target ‘yywl’ do
 pod ‘AFNetworking’,’~>3.1.0’
 end

6、ios 10 以后 plist 里设置相关权限

 Privacy - Bluetooth Peripheral Usage Description 蓝牙权限

 Privacy - Calendars Usage Description 日历权限

 Privacy - Camera Usage Description 照相机

 Privacy - Contacts Usage Description 联系人

 Privacy - Health Share Usage Description 健康数据分享

 Privacy - Health Update Usage Description 健康数据更新

 Privacy - HomeKit Usage Description 智能家具

 Privacy - Location Always Usage Description 一直开启定位

 Privacy - Location Usage Description 位置

 Privacy - Location When In Use Usage Description 需要时开启定位

 Privacy - Media Library Usage Description 播放音乐或者视频

 Privacy - Microphone Usage Description 麦克风

 Privacy - Motion Usage Description 运动传感器

 Privacy - Music Usage Description 音乐

 Privacy - Photo Library Usage Description 相册

 Privacy - Reminders Usage Description 备忘录

 Privacy - Siri Usage Description Siri

 Privacy - Speech Recognition Usage Description 语音识别

 Privacy - TV Provider Usage Description 电视提供商

 Privacy - Video Subscriber Account Usage Description 视频订阅

7、获取APP版本号

     NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
    NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
   versionLabel.text=[NSString stringWithFormat:@"版本号V%@",app_Version];

8、字符串截取、拼接

 1.截取字符串

   NSString*string =@"sdfsfsfsAdfsdf";
   string = [string substringToIndex:7];//截取掉下标7之后的字符串
   NSLog(@"截取的值为：%@",string);
   [string substringFromIndex:2];//截取掉下标2之前的字符串
   NSLog(@"截取的值为：%@",string);


 2.匹配字符串
 NSString*string =@"sdfsfsfsAdfsdf";
 NSRangerange = [stringrangeOfString:@"f"];//匹配得到的下标
 NSLog(@"rang:%@",NSStringFromRange(range));
 string = [string substringWithRange:range];//截取范围类的字符串
 NSLog(@"截取的值为：%@",string);


3.分隔字符串
 NSString*string =@"sdfsfsfsAdfsdf";

 NSArray *array = [string componentsSeparatedByString:@"A"]; //从字符       A中分隔成2个元素的数组
 NSLog(@"array:%@",array); //结果是adfsfsfs和dfsdf

9、设置导航栏字体大小 颜色

方法一:

自定义视图,定义一个lable,相关属性在lable里设置

核心方法:

self.navigationItem.titleView = titleLabel;

方法二:用系统方法直接设置

[self.navigationController.navigationBar setTitleTextAttributes:@{

                                                                  NSFontAttributeName:[UIFont systemFontOfSize:20],

                                                                  NSForegroundColorAttributeName:WhiteColor

                                                                  }];

10、iOS11关于隐藏导航栏后TableView界面出现下移问题(ScrollView同理)

if (@available(iOS 11.0, *)) {
    self.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
} else {
    self.automaticallyAdjustsScrollViewInsets = NO;
}

11、限制cell 连续点击 （button 同理）

DriveCarCell *cell = [tableView cellForRowAtIndexPath:indexPath];

cell.userInteractionEnabled=NO;
if（cell.userInteractionEnabled==NO）{

  [self showHud:@"点击过于频繁 "];
  }
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    cell.userInteractionEnabled=YES;
});

12、ios TableView cell刷新 section刷新

section 刷新

      NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:1];    
      [tableview reloadSections:indexSet     withRowAnimation:UITableViewRowAnimationAutomatic];

cell 刷新

       NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];    
      [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];

13、限制textField 输入小数点 前两位

  -(BOOL)textField:(UITextField *)textField     shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
       // 判断是否有小数点
      if ([textField.text containsString:@"."]) {
      self.isHaveDian = YES;
    }else{
      self.isHaveDian = NO;
     }
    if (string.length > 0) {
         //当前输入的字符
  unichar single = [string characterAtIndex:0];
  // 不能输入.0-9以外的字符
  if (!((single >= '0' && single <= '9') || single == '.')) return NO;
  // 只能有一个小数点
  if (self.isHaveDian && single == '.') return NO;
  // 如果第一位是.则前面加上0.
  if ((textField.text.length == 0) && (single == '.')) {
      textField.text = @"0";
  }
  // 如果第一位是0则后面必须输入点，否则不能输入。
  if ([textField.text hasPrefix:@"0"]) {
      if (textField.text.length > 1) {
          NSString *secondStr = [textField.text substringWithRange:NSMakeRange(1, 1)];
          if (![secondStr isEqualToString:@"."]) return NO;
      }else{
          if (![string isEqualToString:@"."]) return NO;
      }
  }
  // 小数点后最多能输入两位
  if (self.isHaveDian) {
      NSRange ran = [textField.text rangeOfString:@"."];
      // 由于range.location是NSUInteger类型的，所以这里不能         通过(range.location - ran.location)>2来判断
      if (range.location > ran.location) {
          if ([textField.text pathExtension].length > 1) return NO;
      }
  }
}
return YES;

}