知识点总结23:网络请求,并设置button的image

#import "ZGKMeFooterView.h"
#import "AFNetworking.h"
#import "MJExtension.h"
#import "ZGKMeSquareBtn.h"
#import "UIImageView+WebCache.h"
#import "UIButton+WebCache.h"
@implementation ZGKMeFooterView

- (instancetype)initWithFrame:(CGRect)frame{
    if (self = [super initWithFrame:frame]) {
        
        // 1.url & 参数
        NSString *url = @"http://api.budejie.com/api/api_open.php";
        NSMutableDictionary *paraDict = [NSMutableDictionary dictionary];
        paraDict[@"a"] = @"square";
        paraDict[@"c"] = @"topic";
        
//        [[AFHTTPSessionManager manager] GET:url parameters:paraDict progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
//            /*
//             -[__NSDictionaryI writeToFile:options:error:]: unrecognized selector sent to instance 0x600000275ac0'
//             */
//            // 1.该方法会报错,因为NSDictionary没有该方法
//            [responseObject writeToFile:@"/Users/winson/Desktop/MyProject/5天/data.plist" options:0 error:nil];
//            ZGKLog(@"请求数据成功 - %@ %@", [responseObject class], responseObject)
//        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
//            ZGKLog(@"请求数据失败 - %@", error)
//        }];
        
        // 2.AFNetWorking在发送https请求的时候会有点问题,但是设置为NO,则可以解决
//        [AFHTTPSessionManager manager].securityPolicy.validatesDomainName = NO;
        
        
        [[AFHTTPSessionManager manager] GET:url parameters:paraDict progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary* responseObject) {
            // 通过打印得知,该数据类型是字典,所以可以将id 改为 NSDictionary, 不然运行时调用方法时,会出错(拿来参考返回值的)
//            [responseObject writeToFile:@"/Users/winson/Desktop/MyProject/5天/data.plist" atomically:YES];
            
            // 字典转模型(此处是字典数组转模型数组),分类最好加前缀,例如这里的"mj_"
            NSArray *squares = [ZGKMeSquareBtn mj_objectArrayWithKeyValuesArray:responseObject[@"square_list"]];
            ZGKLog(@"字典转模型%@", squares);
            [self creatSquaresBtn:squares];
//            ZGKLog(@"请求数据成功 - %@ %@", [responseObject class], responseObject)
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            ZGKLog(@"请求数据失败 - %@", error)
        }];
        
    };
    return self;
}
 
/**** 根据模型数据创建对应的控件 ****/
- (void)creatSquaresBtn: (NSArray *)squares{
    
    // 1.方块个数
    NSUInteger count = squares.count;
    
    // 2.方块参数
    int maxColsCount = 4;
    CGFloat maxWidth = self.zgk_width / 4;
    CGFloat maxHeight = maxWidth;
    
    // 3.创建按钮并设置模型数据
    for (int index = 0; index < count; index ++) {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        [self addSubview:btn];
        
        // 设置btn的frame
        btn.zgk_x = (index % maxColsCount) * maxWidth;
        btn.zgk_y = (index / maxColsCount) * maxHeight;
        btn.zgk_width = maxWidth;
        btn.zgk_height = maxHeight;
        
        btn.backgroundColor = ZGKRandomColor;
        
        
        // 4.拿到模型数据,并赋值
        ZGKMeSquareBtn *square = squares[index];
        
        [btn setTitle:square.name forState:UIControlStateNormal];
        // 该方法没有指定btn的状态,所以不能设置成功(btn比较特殊)
        // 下面这个方法一般用于普通控件,按钮btn比较特殊,需要指定状态
//        [btn.imageView sd_setImageWithURL:[NSURL URLWithString:@"square.icon"] placeholderImage:[UIImage imageNamed:@"mine_icon_random"]];
        
        // 可以通过[SDWebImageManager sharedManager]下载以后再进行赋值(这个可以拿到image存储url)
        // 需#import "UIImageView+WebCache.h"
//        [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:square.icon] options:0 progress:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
//            [btn setImage:image forState:UIControlStateNormal];
//        }];
        
        // 这个方法是btn特有的,这里直接使btn,而不是btn.image来设置图片,因为按钮在设置图片时才要指定状态
        // 需#import "UIButton+WebCache.h"
        [btn sd_setImageWithURL:[NSURL URLWithString:square.icon] forState:UIControlStateNormal];
        
        // 5.监听按钮的点击
        [btn addTarget:self action:@selector(squareBtnClick:) forControlEvents:UIControlEventTouchUpInside];
    }
}

/**** 超过父控件部分,点击是无法响应的,要么改变父控件的大小,要么重写hitTest方法 ****/
- (void)squareBtnClick:(UIButton *)button{
    
    ZGKLogFunc
}
    
@end

总结:
1.按钮设置图片和一般控件设置图片不同,需要指定状态才能设置成功
2.超过父控件部分,点击是无法响应的,要么改变父控件的大小,要么重写hitTest方法
3.2.AFNetWorking在发送https请求的时候会有点问题,但是设置为NO,则可以解决:
[AFHTTPSessionManager manager].securityPolicy.validatesDomainName = NO;
4.注意请求回来的对象的真实类型,id类型的对象在打方法的时候,显示出来的并不一定是正确的,可能在运行的时候就会崩溃,如:

• 下面方法会报错,因为NSDictionary没有该方法

[responseObject writeToFile:@"/Users/winson/Desktop/MyProject/5天/data.plist" options:0 error:nil];

• 正确写法如下:

 [[AFHTTPSessionManager manager] GET:url parameters:paraDict progress:nil success:^(NSURLSessionDataTask * _Nonnull task, NSDictionary* responseObject) {
            // 通过打印得知,该数据类型是字典,所以可以将id 改为 NSDictionary, 不然运行时调用方法时,会出错(拿来参考返回值的)
//            [responseObject writeToFile:@"/Users/winson/Desktop/MyProject/5天/data.plist" atomically:YES];

            // 字典转模型(此处是字典数组转模型数组),分类最好加前缀,例如这里的"mj_"
            NSArray *squares = [ZGKMeSquareBtn mj_objectArrayWithKeyValuesArray:responseObject[@"square_list"]];
            ZGKLog(@"字典转模型%@", squares);
            [self creatSquaresBtn:squares];
//            ZGKLog(@"请求数据成功 - %@ %@", [responseObject class], responseObject)
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            ZGKLog(@"请求数据失败 - %@", error)
        }];

    };