#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>@interface LLPic : NSObject// 图片地址
@property (nonatomic, copy) NSString *icon;// 图片
@property (nonatomic, strong) UIImage *image;// 描述
@property (nonatomic, copy) NSString *desc;+ (instancetype)picWithDic:(NSDictionary *)dic;
- (instancetype)initWithDic:(NSDictionary *)dic;+ (NSArray *)array;@end

#import "LLPic.h"@interface LLPic ()
{UIImage *_imageABC;
}
@end@implementation LLPic+ (NSArray *)array
{NSString *path = [[NSBundle mainBundle] pathForResource:@"images.plist" ofType:nil];NSArray *arrPic = [NSArray arrayWithContentsOfFile:path];NSMutableArray *arrPicMA = [[NSMutableArray alloc] initWithCapacity:arrPic.count];for (NSDictionary *dic in arrPic) {[arrPicMA addObject:[self picWithDic:dic]];}return arrPicMA;
}- (UIImage *)image
{if (!_imageABC) {_imageABC = [UIImage imageNamed:self.icon];}return _imageABC;
}- (instancetype)initWithDic:(NSDictionary *)dic
{if (self = [super init]) {[self setValuesForKeysWithDictionary:dic];}return self;
}+ (instancetype)picWithDic:(NSDictionary *)dic
{return [[self alloc] initWithDic:dic];
}@end

#import "ViewController.h"
#import "LLPic.h"
@interface ViewController ()// 属性值必须改为strong，如果联系IBOutLet则为week
@property (nonatomic, strong) NSArray *picView;
@property (nonatomic, strong) UILabel *headLab;
@property (nonatomic, strong) UIImageView *imageView;
@property (nonatomic, strong) UIButton *leftBtn;
@property (nonatomic, strong) UIButton *rightBtn;
@property (nonatomic, strong) UILabel *footLab;
@property (nonatomic, strong) UIButton *leftRotationBtn; // 左旋转
@property (nonatomic, strong) UIButton *rightRotationBtn; // 右旋转
// 计数器
@property (nonatomic, assign) int index;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.self.view.backgroundColor = [UIColor purpleColor];[self loadPicView];
}#pragma mark - 按钮点击事件
// 左点击
- (void)leftBtnClick
{self.index--;[self loadPicView];
}
// 右点击
- (void)rightBtnClick
{self.index++;[self loadPicView];
}// 按钮旋转事件
- (void)rotationBtn:(UIButton *)btn
{[UIView animateWithDuration:0.2 animations:^{if (btn.tag == 20) {self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, M_PI_4);} else if (btn.tag == 40){self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, -M_PI_4);}}];
}#pragma mark - 展示界面
- (void)loadPicView
{// 1,拿出模型对象
    LLPic *pic = self.picView[self.index];self.headLab.text = [NSString stringWithFormat:@"%d/%ld", self.index+1, self.picView.count];self.imageView.image = [UIImage imageNamed:pic.icon];self.footLab.text = pic.desc;self.leftBtn.enabled = (self.index != 0);self.rightBtn.enabled = (self.index != (self.picView.count-1));// 2,加载按钮
    [self creatRoationBtn];}
#pragma mark - 懒加载控件，代码可读性强，并且提高性能
// headLab的加载
- (UILabel *)headLab
{if (!_headLab) {_headLab = [[UILabel alloc] initWithFrame:CGRectMake(10, 20, 300, 30)];_headLab.textAlignment = NSTextAlignmentCenter;[self.view addSubview:_headLab];}return _headLab;
}// imageView的加载
- (UIImageView *)imageView
{if (!_imageView) {_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(70, 70, 180, 180)];[self.view addSubview:_imageView];}return _imageView;
}// leftBtn的加载
- (UIButton *)leftBtn
{if (!_leftBtn) {_leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];_leftBtn.frame = CGRectMake(0,125, 40, 40);[_leftBtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];[_leftBtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];[_leftBtn setBackgroundImage:[UIImage imageNamed:@"left_disable"] forState:UIControlStateDisabled];// 按钮点击事件
        [_leftBtn addTarget:self action:@selector(leftBtnClick) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_leftBtn];}return _leftBtn;
}// rightBtn的加载
- (void)creatRoationBtn
{_rightRotationBtn = [UIButton buttonWithType:UIButtonTypeCustom];_rightRotationBtn.frame = CGRectMake(200,400,40, 40);[_rightRotationBtn setBackgroundImage:[UIImage imageNamed:@"right_rotate_normal"] forState:UIControlStateNormal];[_rightRotationBtn setBackgroundImage:[UIImage imageNamed:@"right_rotate_highlighted"] forState:UIControlStateHighlighted];_rightRotationBtn.tag = 20;[_rightRotationBtn addTarget:self action:@selector(rotationBtn:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_rightRotationBtn];_leftRotationBtn = [UIButton buttonWithType:UIButtonTypeCustom];_leftRotationBtn.frame = CGRectMake(100,400,40, 40);[_leftRotationBtn setBackgroundImage:[UIImage imageNamed:@"left_rotate_normal"] forState:UIControlStateNormal];[_leftRotationBtn setBackgroundImage:[UIImage imageNamed:@"left_rotate_highlighted"] forState:UIControlStateHighlighted];_leftRotationBtn.tag = 40;[_leftRotationBtn addTarget:self action:@selector(rotationBtn:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_leftRotationBtn];}
- (UIButton *)rightBtn
{if (!_rightBtn) {_rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];_rightBtn.frame = CGRectMake(280,125,40, 40);[_rightBtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];[_rightBtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];[_rightBtn setBackgroundImage:[UIImage imageNamed:@"right_disable"] forState:UIControlStateDisabled];[_rightBtn addTarget:self action:@selector(rightBtnClick) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:_rightBtn];}return _rightBtn;}// 描述lab
- (UILabel *)footLab
{if (!_footLab) {_footLab = [[UILabel alloc] initWithFrame:CGRectMake(10, 260, 300, 60)];_footLab.textAlignment = NSTextAlignmentCenter;_footLab.numberOfLines = 0;[self.view addSubview:_footLab];}return _footLab;
}#pragma mark - 加载数据模型
- (NSArray *)picView
{if (!_picView) {_picView = [LLPic array];}return _picView;
}@end