iOS的一些小技巧

状态栏文字颜色修改

//info.plist中添加一个字段：view controller -base status bar 设置为NO 设置状态栏文字为白色
    
//有动画效果
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];

//无动画效果
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];

状态栏自定义～

UIView *statusBarView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 20)];
    
statusBarView.backgroundColor=[UIColor blackColor];
    
[YouNav.view addSubview:statusBarView];
    
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];

Tabbar透明

 UITabBarController *tabVC = [[UITabBarController alloc] init];
    //获得tabbar
 UITabBar *tabBar = tabVC.tabBar;
    //设置透明度
  [tabBar setAlpha:0.8f];

 TabBar badgeValue

    //tabbar index
    int TabIndex = 1;
    //bageValue
    NSString *badgeValue = [NSString stringWithFormat:@"%d",num++];
    //Set
    [[[[[self tabBarController] viewControllers] objectAtIndex: TabIndex] tabBarItem] setBadgeValue:badgeValue];

 

TabBar字体,大小,颜色

[[UITabBarItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
                                                   [UIColor colorWithRed:0.439f green:0.435f blue:0.439f alpha:1.00f], NSForegroundColorAttributeName,
                                                    [UIFont fontWithName:@"Helvetica" size:11], NSFontAttributeName,nil] forState:UIControlStateNormal];

//选中后颜色
 [tabBar setTintColor:[UIColor colorWithRed:0.212f green:0.682f blue:0.776f alpha:1.00f]];

 

GitHub

//终端本地生成Key,路径 /User/YourMacName/.ssh/ 用文本编辑器打开后,复制到github的addsshkey的页面中
$ ssh-keygen -t rsa -C "your_email@youremail.com"   


//Github Push等不正常. 改协议, HTTPS->SSH 
//只要将地址按如下格式即可...

https://github.com/USERNAME/OTHERREPOSITORY.git

git@github.com:USERNAME/OTHERREPOSITORY.git

 

放置多个UITableView或UICollectionView,首个UITableView,UICollectionView布局不正确

原因是iOS默认开启了自动布局,而第一个添加的view,会被默认拉伸适配.

    //解决方法一,在self.view 的第一层添加一空白view
    [self.view addSubview:[UIView new]];
    
    //解决方法二 关闭自动布局
    self.automaticallyAdjustsScrollViewInsets = NO;

 

AFNetWorking传输json数组,对数组进行jason序列化

+ (void)PostData:(NSString*)url NotificationName:(NSString*)Name ForKey:(NSString*)Key SetArrayParameters:(NSArray*)parameters
{
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    //  设置发送请求格式
    manager.requestSerializer = [AFJSONRequestSerializer serializer];
    // 设置返回格式
    //manager.responseSerializer = [AFHTTPResponseSerializer serializer];

    [manager POST:[NSString stringWithFormat:@"%s%@",ServerUrl,url] parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
        if (responseObject) {
            [[NSNotificationCenter defaultCenter]postNotificationName:Name object:self userInfo:[NSDictionary dictionaryWithObject:responseObject forKey:Key]];
            
            NSLog(@"res:%@",responseObject);
        }
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }];
}

 

 

使用KVO的时候千万要记得取消通知注册,否则会出现重复收到数据的情况.尤其是

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(UpdateStatus:) name:@"getBlance" object:nil];

写在viewload,viewWillAppear等,会造成通知重复注册多次.如果在UpdateStatus还写有响应的网络请求,就会出现多次重复提交的情况

 

-(void)viewWillDisappear:(BOOL)animated
{
     [[NSNotificationCenter defaultCenter] removeObserver:self name:@"getBlance" object:nil];
     [[NSNotificationCenter defaultCenter] removeObserver:self name:@"AddPassVerify" object:nil];
}

 

 

多变的自定义Cell,解决重用机制会导致内容出错

UITableViewCell *cell = [tableview dequeueReusableCellWithIdentifier:defineString]

修改为：UITableViewCell *cell = [tableview cellForRowAtIndexPath:indexPath];

 

 自定义字体有时候会碰到在模拟器上可用,在真机上获取不到的情况.一般是模拟器上的字体名和真机上的不一样(这点我不确定).总之还是直接跑下面的代码,获取字体名,比较好.

NSArray *familyNames =[[NSArray alloc]initWithArray:[UIFont familyNames]];
    NSArray *fontNames;
    NSInteger indFamily, indFont;
    NSLog(@"[familyNames count]===%lu",(unsigned long)[familyNames count]);
    for(indFamily=0;indFamily<[familyNames count];++indFamily)
        
    {
        NSLog(@"Family name:%@", [familyNames objectAtIndex:indFamily]);
        fontNames =[[NSArray alloc]initWithArray:[UIFont fontNamesForFamilyName:[familyNames objectAtIndex:indFamily]]];
        
        for(indFont=0; indFont<[fontNames count]; ++indFont)
            
        {
            NSLog(@"Font name:<%@>",[fontNames objectAtIndex:indFont]);
            
        }
        
    }

 

待续。。。