1：FCUUID获取设备标识的运用

a:作者 githun地址 https://github.com/fabiocaccamo/FCUUID

因为里面还用到作者的另外一个类UICKeyChainStore地址：https://github.com/kishikawakatsumi/UICKeyChainStore

b：在项目中添加 Security.framework

c：导入头文件 #import “FCUUID.h"

// 每次运行应用都会变

+(NSString *)uuid;

//changes each time (no persistent), but allows to keep in memory more temporary uuids

+(NSString *)uuidForKey:(id<NSCopying>)key;

// 每次运行应用都会变

+(NSString *)uuidForSession;

// 重新安装的时候会变

+(NSString *)uuidForInstallation;

// 卸载后重装会变

+(NSString *)uuidForVendor;

// 抹掉iPhone的时候才会变，适合做唯一标识

+(NSString *)uuidForDevice;

 

2:在图片增加一个外围的白色边框

-(UIImage*) circleImage:(UIImage*) image withParam:(CGFloat) inset {
    
    //UIGraphicsBeginImageContext(image.size);
    //解决失真 模糊的问题
    UIGraphicsBeginImageContextWithOptions(image.size, NO, [[UIScreen mainScreen] scale]);
    CGContextRef context =UIGraphicsGetCurrentContext();
    
    //圆的边框宽度为2，颜色为红色
    
    CGContextSetLineWidth(context,2);
    
    CGContextSetStrokeColorWithColor(context, [UIColor whiteColor].CGColor);
    
    CGRect rect = CGRectMake(inset, inset, image.size.width - inset *2.0f, image.size.height - inset *2.0f);
    
    CGContextAddEllipseInRect(context, rect);
    
    CGContextClip(context);
    
    //在圆区域内画出image原图
    
    [image drawInRect:rect];
    
    CGContextAddEllipseInRect(context, rect);
    
    CGContextStrokePath(context);
    
    //生成新的image
    
    UIImage *newimg = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return newimg;
    
}

注意：如果使用UIGraphicsBeginImageContext(image.size);会导致图片有点失真模糊，可以采用 UIGraphicsBeginImageContextWithOptions(image.size, NO, [[UIScreen mainScreen] scale]);还有如果在视图上进行画圆，只有在视图没有其它盖住时才看得到，比如如果有个背景图片，那么它就没盖住了；

 3：在普通视图控制器包一个UINavigation

#pragma mark 添加导航栏
-(void)addNavigationBar{
    //创建一个导航栏
    UINavigationBar *navigationBar=[[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, 320, 44+20)];
    //navigationBar.tintColor=[UIColor whiteColor];
    [self.view addSubview:navigationBar];
    //创建导航控件内容
    UINavigationItem *navigationItem=[[UINavigationItem alloc]initWithTitle:@"Web Chat"];
    
    //左侧添加登录按钮
    UIBarButtonItem *loginButton=[[UIBarButtonItem alloc]initWithTitle:@"登录" style:UIBarButtonItemStyleDone target:self action:@selector(login)];
    
    navigationItem.leftBarButtonItem=loginButton;
    
    //添加内容到导航栏
    [navigationBar pushNavigationItem:navigationItem animated:NO];
}

 4:系统自带定位坐标转为城市名

    //系统自带定位
    [[MPLocationManager shareInstance] startSystemLocationWithRes:^(CLLocation *loction, NSError *error) {
        if (!error) {
            CLGeocoder *geocoder=[[CLGeocoder alloc]init];
            [geocoder reverseGeocodeLocation:loction completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
                if (placemarks.count>0) {
                    CLPlacemark *placemark=[placemarks objectAtIndex:0];
                    //获取城市
                    NSString *city = placemark.locality;
                    if (!city) {
                        //四大直辖市的城市信息无法通过locality获得，只能通过获取省份的方法来获得（如果city为空，则可知为直辖市）
                        city = placemark.administrativeArea;
                    }
                    //有差异才改变
                    if(![BBUserDefault.LocationCity isEqualToString:city])
                    {
                        BBUserDefault.LocationCity=city;
                    }
                    
                    NSLog(@"当前城市：[%@]",city);
                }
            }];