最近有點懶，又是很久沒有寫點東西，就連日記都是前兩個月才更新的。當然诗祸，找理由真的是我的強項。(哭著笑.臉)

先上效果圖：
中間隨便設置一個ImageView對象就行粪躬，然后直接放大招瑰排，一句話切換頭像。
代碼如下：

#import "ViewController.h"
#import "UIViewController+HeadFunction.h"

@interface ViewController ()
@property (nonatomic, strong) UIImageView *imageView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
  
    self.view.backgroundColor = [UIColor whiteColor];
    
    _imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
    _imageView.center = self.view.center;
    _imageView.image = [UIImage imageNamed:@"頭像"];
    _imageView.layer.cornerRadius = _imageView.frame.size.width/2;
    _imageView.layer.masksToBounds = YES;
    
    [self.view addSubview:_imageView];
    
//  是的支鸡，你沒看錯冬念，就是這一句代碼
    [self changeHeadImageWithHeadImageView:_imageView];
}

- (void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:YES];
    NSUserDefaults *userdefaults = [NSUserDefaults standardUserDefaults];
    // 判斷沙盒里是否有圖片文件
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@HeadImage.png",[userdefaults stringForKey:@"123"]]];   // 保存文件的名稱
    NSFileManager *fileManager = [NSFileManager defaultManager];
    BOOL result = [fileManager fileExistsAtPath:filePath];
    if (result) {
        _imageView.image = [UIImage imageWithContentsOfFile:filePath];
    }
    else {
        _imageView.image = [UIImage imageNamed:@"頭像"];
    }
}
@end

上面那個- (void)viewWillAppear:(BOOL)animated的代碼是為了加載出上一次運行時保存在沙盒里的圖片，如果沙盒沒有苍匆，就加載默認設置的刘急。
最重要的那句代碼就是這句啦：
** [self changeHeadImageWithHeadImageView:_imageView];**
我們只需要將ImageView這個對象傳進去即可。

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#import "UIViewController+HeadFunction.h"
#import "UIViewController+ActionSheet.h"
#import <objc/runtime.h>

static const char *HeadManagerKey = "HeadManagerKey";
static const char *HeadPictureViewKey = "HeadPictureViewKey";

@implementation UIViewController (HeadFunction)

- (void)setHeadPictureView:(UIImageView *)headPictureView {
   // 第一個參數(shù)：給哪個對象添加關聯(lián)
   // 第二個參數(shù)：關聯(lián)的key戈轿，通過這個key獲取
   // 第三個參數(shù)：關聯(lián)的value
   // 第四個參數(shù):關聯(lián)的策略
   objc_setAssociatedObject(self, HeadPictureViewKey, headPictureView, OBJC_ASSOCIATION_ASSIGN);
}

- (UIImageView *)headPictureView {
   return objc_getAssociatedObject(self, HeadPictureViewKey);
}

- (void)setHeadManager:(HeadManager *)headManager {
   objc_setAssociatedObject(self, HeadManagerKey, headManager, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (HeadManager *)headManager {
   return objc_getAssociatedObject(self, HeadManagerKey);
}

#pragma mark - ChangeHeadImage
- (void)changeHeadImageWithHeadImageView:(UIImageView *)headImageView{
   self.headPictureView = headImageView;
   UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(headImageChange:)];
   self.headPictureView.userInteractionEnabled = YES;
   [self.headPictureView addGestureRecognizer:tap];
}

- (void)headImageChange:(UIGestureRecognizer *)tap{
   
   NSNotificationCenter *notificationDefaultCenter = [NSNotificationCenter defaultCenter];
   if (tap.state == UIGestureRecognizerStateEnded) {
       self.headManager = [[HeadManager alloc] initWithTarget:self];
       __weak __typeof(self) weakSelf = self;
       self.headManager.cropImageBlock = ^(UIImage *cropImage){
           weakSelf.headPictureView.image = cropImage;
           [notificationDefaultCenter postNotificationName:headImageUpdateNotificationKey object:nil userInfo:@{headImageValue:cropImage}];
           weakSelf.headManager = nil;
       };
       [self actionSheet:^{
           [self.headManager checkCameraAvailability:^(BOOL auth) {
               if (!auth) {
                   NSLog(@"沒有訪問相機權限");
                   return;
               }
           }];
           
           [self.headManager openTakePhoto];
           
       } ppBlock:^{
           [self.headManager openPhotoalbums];
       }];
   }
   
}

@end

就是在這里加的tap手勢：嘻嘻~~~

一句代碼里的詳細內(nèi)容

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