iOS小技术点备忘录

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记录一些小技术点，方便使用时查找。

更改UITabBar && UINavigationBar背景颜色

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[[UITabBar appearance] setBarTintColor:[UIColor redColor]];
[[UINavigationBar appearance] setBarTintColor:[UIColor redColor]];

更改UITabBar && UINavigationBar字体颜色

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//改变按钮navigationBar tintColor颜色
self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:102/255.0 green:102/255.0 blue:102/255.0 alpha:1.0];
//改变tabbar 正常颜色，选中色
 NSDictionary *attributeNormal = @{NSForegroundColorAttributeName:[UIColor grayColor]};
[subVC.tabBarItem setTitleTextAttributes:attributeNormal forState:(UIControlStateNormal)];
 NSDictionary *attributeSelected = @{NSForegroundColorAttributeName:[UIColor redColor]};
[subVC.tabBarItem setTitleTextAttributes:attributeSelected forState: (UIControlStateSelected)];

设置UIViewController的view的top在navigationBar下面 & bottom位置在Tabbar的上面

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tabBarController.tabBar.translucent = NO;
uiviewController.navigationController.navigationBar.translucent = NO;

改变UISlider的进度条高度

需要继承UISlider并t重载trackRectForBounds方法

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- (CGRect)trackRectForBounds:(CGRect)bounds
{
    return CGRectMake(0, 0, CGRectGetWidth(self.frame), 5.0);
}

UIPageViewController 翻页效果

UIPageViewController的默认翻页效果类似于翻书的效果，如果想要平铺翻页和指定翻页方向呢？我们发现有navigationOrientation和transitionStyle两个属性，但是这两个属性是只读的，查看.h文件可知UIPageViewController提供了init方法

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- (instancetype)initWithTransitionStyle:(UIPageViewControllerTransitionStyle)style navigationOrientation:(UIPageViewControllerNavigationOrientation)navigationOrientation options:(nullable NSDictionary<NSString *, id> *)options NS_DESIGNATED_INITIALIZER;

所以需要改变默认的翻页效果和方向可以通过init方法实现；
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NSDictionary *options = @{UIPageViewControllerOptionInterPageSpacingKey : @(0)};
   _pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll
                                                         navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
                                                                       options:options];

push新页面时隐藏tabbar

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UIViewController *viewController = [[UIViewController alloc] init];
[viewController setHidesBottomBarWhenPushed:YES];//一定要在push之前调用
[self.navigationController pushViewController:viewController animated:YES];

Xcode Build Settings Reference , pods配置时使用的key对照表

https://pewpewthespells.com/blog/buildsettings.html

正则匹配

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- (BOOL)telePhoneMatchRules { //11位数字
    BOOL match = NO;
    NSString *telePhone = _telephoneField.text;
    if (telePhone.length > 0){
        NSString *regex = @"^\\d{11}$";
        NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
        match = [pred evaluateWithObject:telePhone];
    }
    return NO;
}

更多正则参考：http://www.cnblogs.com/zxin/archive/2013/01/26/2877765.html

push到下级页面之前，无感知的移除某几个上级页面

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[self.navigationController pushViewController:nextVC animated:YES];
NSMutableArray *controllers = [NSMutableArray array];
            //移除前面的几个vc
            for(UIViewController *viewController in self.navigationController.viewControllers){
                if(![viewController isKindOfClass:[UIViewController1 class]] &&
                   ![viewController isKindOfClass:[UIViewController2 class]] &&
                   ![viewController isKindOfClass:[UIViewController3 class]]){
                    [controllers addObject:viewController];
                }
            }
            [self.navigationController setViewControllers:[controllers copy]];

自定义UITableViewCell多选模式下选中和未选中的图片

在cell中实现

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- (void)layoutSubviews {
    [super layoutSubviews];
    for (UIControl *control in self.subviews) {
        if ([control isMemberOfClass:NSClassFromString(@"UITableViewCellEditControl")]) {
            for(UIView *view in control.subviews) {
              //找到选中时的image
                if ([view isKindOfClass:[UIImageView class]]) {
                    UIImageView *imageView = (UIImageView *)view;
                    imageView.contentMode = UIViewContentModeScaleToFill;
                    if(self.selected) {
                        imageView.image = [UIImage imageNamed:@"ac_selectedImage"];
                    }else {
                        imageView.image = [UIImage imageNamed:@"ac_disSelectedImage"];
                    }
                }
            }
        }
    }
}

判断今天、明天、后天

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NSTimeInterval sencondDay = 24 * 60 * 60;
NSDate *today = [NSDate date];
NSDate *tomorrow = [today dateByAddingTimeInterval:sencondDay];
NSDate *postnatal = [today dateByAddingTimeInterval:sencondDay * 2];
// 10 first characters of description is the calendar date:
NSString *todayString = [[today description] substringToIndex:10];
NSString *tomorrowString = [[tomorrow description] substringToIndex:10];
NSString *postnatalString = [[postnatal description] substringToIndex:10];
NSString *dateString = [[date description] substringToIndex:10];
if ([todayString isEqualToString:dateString]) {
    repeatDetail = @"今天   仅一次";
}
else if ([tomorrowString isEqualToString:dateString]) {
    repeatDetail = @"明天   仅一次";
}
else if ([postnatalString isEqualToString:dateString]) {
    repeatDetail = @"后天   仅一次";
}

隐藏导航条和显示导航条的页面间返回手势平滑切换

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- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //重点方法
    [self.navigationController setNavigationBarHidden:YES animated:YES]; 
    //[self.navigationController setNavigationBarHidden:NO animated:YES]; //从不显示的页面返回显示页面
}

或者是使用开源库：FDFullscreenPopGesture

改变UITableViewCell复选框默认图

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- (void)layoutSubviews {
    [super layoutSubviews];
    for (UIControl *control in self.subviews) {
        if ([control isMemberOfClass:NSClassFromString(@"UITableViewCellEditControl")]) {
            for(UIView *view in control.subviews) {
              //找到选中时的image
                if ([view isKindOfClass:[UIImageView class]]) {
                    UIImageView *imageView = (UIImageView *)view;
                    imageView.contentMode = UIViewContentModeScaleToFill;
                    if(self.selected) {
                        imageView.image = [UIImage imageNamed:@"ac_selectedImage"];
                    }else {
                        imageView.image = [UIImage imageNamed:@"ac_disSelectedImage"];
                    }
                }
            }
        }
    }
}

但是会偶现某些cell还是出现默认复选框的情况，应该是重用时没有触发layoutSubviews导致，所以并不是很好

设备信息，app信息

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NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  
// app名称  
 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"];  
  
//手机序列号  
NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];  
NSLog(@"手机序列号: %@",identifierNumber);  
//手机别名： 用户定义的名称  
NSString* userPhoneName = [[UIDevice currentDevice] name];  
NSLog(@"手机别名: %@", userPhoneName);  
//设备名称  
NSString* deviceName = [[UIDevice currentDevice] systemName];  
NSLog(@"设备名称: %@",deviceName );  
//手机系统版本  
NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];  
NSLog(@"手机系统版本: %@", phoneVersion);  
//手机型号  
NSString* phoneModel = [[UIDevice currentDevice] model];  
NSLog(@"手机型号: %@",phoneModel );  
//地方型号  （国际化区域名称）  
NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];  
NSLog(@"国际化区域名称: %@",localPhoneModel );  
  
NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  
// 当前应用名称  
NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];  
NSLog(@"当前应用名称：%@",appCurName);  
// 当前应用软件版本  比如：1.0.1  
NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];  
NSLog(@"当前应用软件版本:%@",appCurVersion);  
// 当前应用版本号码   int类型  
NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];  
NSLog(@"当前应用版本号码：%@",appCurVersionNum);

手机震动一下

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#import <AudioToolbox/AudioToolbox.h>
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

顶部导航条电量信息变色

重写preferredStatusBarStyle方法，比如变成白色

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- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

设置TextField属性之文字距左边框的距离

textfield有个属性leftview,设置一个只有宽度的leftView.然后需要将leftViewMode设置为UITextFieldViewModeAlways.因为默认textfield.leftView是不显示的.

iOS中调整view层级位置的两个属性

控件的层级关系和你加入到父视图的顺序有关，也就是先addsubview至父视图的，层级越低，会被后加入的遮盖。
可以通过以下函数改变子视图的层级
将一个UIView显示在调用者view最前面：

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- (void)bringSubviewToFront:(UIView *)view;

将视图显示在下面：
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- (void)sendSubviewToBack:(UIView *)view;

改变状态栏背景色导致返回手势过程（从有导航条->隐藏导航条）中，导航条突然消失问题

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//重写 UINavigationController 得方法
- (UIViewController *)childViewControllerForStatusBarStyle{
　　return  self.visibleViewController;
}
- (UIViewController *)childViewControllerForStatusBarHidden{
　　return self.visibleViewController;
}

打包突然出现errSecInternalComponent Command /usr/bin/codesign failed with exit code 1错误

Xcode bug，可能是过期证书过多，清理过期证书，或者重启mac！！！

UIPickerView 中间黑线消失的问题

问题描述：使用UIPickerView过程中发现在某种情况下pickview的两条默认的黑线消失了！！！
测试发现在viewDidLoad中add到view上的pickview的线又会显示！！！
查找问题：查找发现黑色线的设置是通过-[UIPickerView _setMagnifierLineColor:]方法设置的，不显示黑线是因为在-[UIPickerView _setMagnifierLineColor:]这个方法调用得时候pickview的subviews为nil，自然给线的view设置颜色无效。但是为什么在viewDidLoad中add到view上的pickview的线会显示呢？断点发现在这种情况下-[UIPickerView _setMagnifierLineColor:]会被调用两次，第一次调用时pickview的subviews依然为nil，第二次subviews中则包含了两根线的view。

猜想：苹果的bug，设置颜色的方法不应该在subviews还没准备好的时候去调用。
暂时的解决办法：在pickview被添加到父view的时候调用layoutSubviews方法，让其subviews先绘制出来;