IOS开发基础知识--碎片35

            userManager.h文件内容：

#import <Foundation/Foundation.h>

@interface userManager : NSObject

@property(nonatomic,copy)NSString *userName;
@property(nonatomic,copy)NSString *passWord;
@property (assign, nonatomic) NSInteger type;

+(userManager *)userManagerWithType:(NSInteger)type;

-(NSString *)toGetParams;

-(void)configWithObj:(userManager *)userManagerInfo;

@end

userManager.m文件内容：

#import "userManager.h"

@implementation userManager


- (instancetype)init
{
    self = [super init];
    if (self) {
        _userName=@"root";
        _passWord=@"123456";
        _type = 0;
    }
    return self;
}

+(userManager *)userManagerWithType:(NSInteger)type
{
    userManager *myManager=[[userManager alloc]init];
    myManager.type=type;
    return myManager;
}

-(void)configWithObj:(userManager *)userManagerInfo
{
    self.userName=userManagerInfo.userName;
    self.passWord=userManagerInfo.passWord;
    self.type=userManagerInfo.type;
}

-(NSString *)toGetParams
{
    return [NSString stringWithFormat:@"当前用户：%@ 密码：%@",self.userName,self.passWord];
}

@end

调用代码：

userManager *myManager=[userManager userManagerWithType:4];
NSLog(@"用户信息：%@",myManager.toGetParams);

            取出cookie

NSArray *cookiesArray = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
NSDictionary *cookieDict = [NSHTTPCookie requestHeaderFieldsWithCookies:cookiesArray];
NSString *cookie = [cookieDict objectForKey:@"Cookie"];
//设置http的header的cookie
[urlRequest setValue:cookie forHTTPHeaderField:@"Cookie”];

删除cookie

NSArray *cookiesArray = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
for (NSHTTPCookie *cookie in cookiesArray) {
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
}

            //
            所有剩余时间数组
NSMutableArray *totalLastTime;
在网络请求到的所有数据中，根据需要将其中要进行倒计时显示的数据中的剩余时间单独保存出来，如果这里是所有的数据都需要倒计时，则只需要保存时间即可，如果是有部分数据才需要倒计时，则可以保存字典，两个键值对分别为其在UITableView的indexPath和剩余时间：num默认从0开始
NSDictionary *dic = @{@"indexPath":[NSStrin stringWithFormat:@"%i",num],@"lastTime": order.payLastTime};
 [totalLastTime addObject:dic];
开启定时器方法：
- (void)startTimer
{
    timer = [NSTimer scheduledTimerWithTimeInterval:1 target:selfselector:@selector(refreshLessTime) userInfo:@"" repeats:YES];
 
如果不添加下面这条语句，在UITableView拖动的时候，会阻塞定时器的调用
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:UITrackingRunLoopMode];
 
}

主要的定时器中的方法，在该方法中，遍历totalLastTime，取出其中保存的lasttime和indexpath，time用来显示，在显示完后自减，indexpath代表对应显示的位置，在一次循环后，将新的time和没有改变的indexpath从新替换totalLastTime 中对应位置的元素，以此保证每一秒执行时，显示time都是最新的。
- (void)refreshLessTime
{
    NSUInteger time;
    for (int i = 0; i < totalLastTime.count; i++) {
        time = [[[totalLastTime objectAtIndex:i] objectForKey:@"lastTime"]integerValue];
        NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:[[[totalLastTime objectAtIndex:i] objectForKey:@"indexPath"] integerValue]];
        WLServiceOrderTableViewCell *cell = (WLServiceOrderTableViewCell *)[_tableView cellForRowAtIndexPath:indexPath];
        cell.remainingTimeLabel.text = [NSString stringWithFormat:@"剩余支付时间：%@",[self lessSecondToDay:--time]];
        NSDictionary *dic = @{@"indexPath": [NSStringstringWithFormat:@"%i",indexPath.section],@"lastTime": [NSStringstringWithFormat:@"%i",time]};
        [totalLastTime replaceObjectAtIndex:i withObject:dic];
    }
}

- (NSString *)lessSecondToDay:(NSUInteger)seconds
{
    NSUInteger day  = (NSUInteger)seconds/(24*3600);
    NSUInteger hour = (NSUInteger)(seconds%(24*3600))/3600;
    NSUInteger min  = (NSUInteger)(seconds%(3600))/60;
    NSUInteger second = (NSUInteger)(seconds%60);
    
    NSString *time = [NSString stringWithFormat:@"%lu日%lu小时%lu分钟%lu秒",(unsigned long)day,(unsigned long)hour,(unsigned long)min,(unsigned long)second];
    return time;
 
}

#import <UIKit/UIKit.h>
#import <objc/runtime.h>
#import "RDVTabBarController.h"

@interface UIViewController (Swizzle)

@end

#import "UIViewController+Swizzle.h"

@implementation UIViewController (Swizzle)

+ (void)load
{
    SEL origSel = @selector(viewDidAppear:);
    SEL swizSel = @selector(swiz_viewDidAppear:);
    [UIViewController swizzleMethods:[self class] originalSelector:origSel swizzledSelector:swizSel];
    
    SEL vcWillAppearSel=@selector(viewWillAppear:);
    SEL swizWillAppearSel=@selector(swiz_viewWillAppear:);
    [UIViewController swizzleMethods:[self class] originalSelector:vcWillAppearSel swizzledSelector:swizWillAppearSel];
}

+ (void)swizzleMethods:(Class)class originalSelector:(SEL)origSel swizzledSelector:(SEL)swizSel
{
    Method origMethod = class_getInstanceMethod(class, origSel);
    Method swizMethod = class_getInstanceMethod(class, swizSel);
    
    //class_addMethod will fail if original method already exists
    BOOL didAddMethod = class_addMethod(class, origSel, method_getImplementation(swizMethod), method_getTypeEncoding(swizMethod));
    if (didAddMethod) {
        class_replaceMethod(class, swizSel, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
    } else {
        //origMethod and swizMethod already exist        method_exchangeImplementations(origMethod, swizMethod);
    }
}

- (void)swiz_viewDidAppear:(BOOL)animated
{
    //可以对控制器名称做过滤 达到过滤哪些是不操作
    NSString *curClassName=NSStringFromClass([self class]);
    if (curClassName.length>0&&([curClassName isEqualToString:@"BDCustomerListViewController"]||[curClassName isEqualToString:@"BDOrdersViewController"]||[curClassName isEqualToString:@"BDDiscoverViewController"]||[curClassName isEqualToString:@"BDMineInfoViewController"])) {
        [self.rdv_tabBarController setTabBarHidden:NO animated:YES];
    }
    //需要注入的代码写在此处    [self swiz_viewDidAppear:animated];
}

-(void)swiz_viewWillAppear:(BOOL)animated
{
    if ([[self.navigationController childViewControllers] count] > 1) {
        [self.rdv_tabBarController setTabBarHidden:YES animated:YES];
    }
    [self swiz_viewWillAppear:animated];
}

@end

说明：+ (void)load 方法是一个类方法，当某个类的代码被读到内存后，runtime会给每个类发送 + (void)load 消息。因此 + (void)load 方法是一个调用时机相当早的方法，而且不管父类还是子类，其 + (void)load 方法都会被调用到，很适合用来插入swizzling方法

#import <UIKit/UIKit.h>

#import "AppDelegate.h"

#import "UIViewController+Swizzle.h"int main(int argc, char * argv[]) {

    @autoreleasepool {

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));

    }

 }

UIImage* img=[UIImage imageNamed:@"2.png"];//原图
UIEdgeInsets edge=UIEdgeInsetsMake(0, 10, 0,10);
     //UIImageResizingModeStretch：拉伸模式，通过拉伸UIEdgeInsets指定的矩形区域来填充图片 上下左右都会
     //UIImageResizingModeTile：平铺模式，通过重复显示UIEdgeInsets指定的矩形区域来填充图
img= [img resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch];
self.imageView.image=img;

项目中的运用：
        self.myImageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 100, 184, 25)];

        UIImage *curImage=[UIImage imageNamed:@"form_no_selected_icon"];

        UIEdgeInsets edge=UIEdgeInsetsMake(0, 40, 0,25);

        curImage= [curImage resizableImageWithCapInsets:edge resizingMode:UIImageResizingModeStretch];

        self.myImageView.image=curImage;

        [self.view addSubview:self.myImageView];