IOS开发基础知识--碎片38

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);
}
}];
}
BBUserDefault.latiude=[NSString stringWithFormat:@"%f",loction.coordinate.latitude];
BBUserDefault.longitude=[NSString stringWithFormat:@"%f",loction.coordinate.longitude];
NSLog(@"定位信息：[%f,%f]",loction.coordinate.latitude,loction.coordinate.longitude);
}];

注意：MPLocationManager.h类的代码如下：

#import <Foundation/Foundation.h>

typedef void(^KSystemLocationBlock)(CLLocation *loction, NSError *error);

@interface MPLocationManager : NSObject

+ (id)shareInstance;

/**
*  启动系统定位
*
*  @param systemLocationBlock 系统定位成功或失败回调成功
*/
- (void)startSystemLocationWithRes:(KSystemLocationBlock)systemLocationBlock;

@end

//
//  MPLocationManager.m
//  MobileProject
//
//  Created by wujunyang on 16/1/15.
//  Copyright © 2016年 wujunyang. All rights reserved.
//

#import "MPLocationManager.h"

@interface MPLocationManager()<CLLocationManagerDelegate>
@property (nonatomic, readwrite, strong) CLLocationManager *locationManager;

@property (nonatomic, readwrite, copy) KSystemLocationBlock kSystemLocationBlock;
@end

@implementation MPLocationManager

+ (id)shareInstance{
static id helper = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
helper = [[MPLocationManager alloc]  init];
});
return helper;
}

#pragma mark - 苹果
/**
*  苹果系统自带地图定位
*/
- (void)startSystemLocationWithRes:(KSystemLocationBlock)systemLocationBlock{
self.kSystemLocationBlock = systemLocationBlock;

if(!self.locationManager){
self.locationManager =[[CLLocationManager alloc] init];
self.locationManager.desiredAccuracy=kCLLocationAccuracyBest;
//        self.locationManager.distanceFilter=10;
if ([UIDevice currentDevice].systemVersion.floatValue >=8) {
[self.locationManager requestWhenInUseAuthorization];//使用程序其间允许访问位置数据（iOS8定位需要）
}
}
self.locationManager.delegate=self;
[self.locationManager startUpdatingLocation];//开启定位
}

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
CLLocation *currLocation=[locations lastObject];
self.locationManager.delegate = nil;
[self.locationManager stopUpdatingLocation];

self.kSystemLocationBlock(currLocation, nil);
}
/**
*定位失败，回调此方法
*/
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
if ([error code]==kCLErrorDenied) {
NSLog(@"访问被拒绝");
}
if ([error code]==kCLErrorLocationUnknown) {
NSLog(@"无法获取位置信息");
}
self.locationManager.delegate = nil;
[self.locationManager stopUpdatingLocation];

self.kSystemLocationBlock(nil, error);
}
@end

5:初始化init传参的一些样例

@implementation ZOCEvent

- (instancetype)initWithTitle:(NSString *)title
date:(NSDate *)date
location:(CLLocation *)location
{
self = [super init];
if (self) {
_title    = title;
_date     = date;
_location = location;
}
return self;
}

- (instancetype)initWithTitle:(NSString *)title
date:(NSDate *)date
{
return [self initWithTitle:title date:date location:nil];
}

- (instancetype)initWithTitle:(NSString *)title
{
return [self initWithTitle:title date:[NSDate date] location:nil];
}

@end

6：embedded dylibs/frameworks are only supported on iOS 8.0 and later 错误解决

ld: warning: embedded dylibs/frameworks only run on iOS 8 or later
ld: embedded dylibs/frameworks are only supported on iOS 8.0 and later (@rpath/XXX.framework/XXX) for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

原因：主要是因为XXX的framework支持的最低开发环境为8.0，而使用该framework的工程支持版本为8.0以下（我这里的环境为4.3）
解决方法：选择低版本的开发环境，重新编译XXX的framework



7:图片左右上下拉伸不变形stretchableImageWithLeftCapWidth

- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:

(NSInteger)topCapHeight 这个函数是UIImage的一个实例函数，它的功能是创建一个内容可拉伸，而边角不拉伸的图片，需要两个参数，第一个是左边不拉伸区域的宽度，第二个参数是上面不拉伸的高度。

根据设置的宽度和高度，将接下来的一个像素进行左右扩展和上下拉伸。

注意：可拉伸的范围都是距离leftCapWidth后的1竖排像素，和距离topCapHeight后的1横排像素。

参数的意义是，如果参数指定10，5。那么，图片左边10个像素，上边5个像素。不会被拉伸，x坐标为11和一个像素会被横向复制，y坐标为6的一个像素会被纵向复制。

注意：只是对一个像素进行复制到一定宽度。而图像后面的剩余像素也不会被拉伸。

UIImage *img=[UIImage imageNamed:@"bubbleSelf.png"];
img=[img stretchableImageWithLeftCapWidth:15 topCapHeight:12];
UIImageView *imgView=[[UIImageView alloc]initWithImage:img];
[imgView setFrame:CGRectMake(10, 10, 200, 200)];
[self. view addSubview:imgView];