运行时 #import <objc/runtime.h>

来源：互联网发布：手机淘宝设置店铺分类编辑：程序博客网时间：2024/04/27 19:46

一.实现runtime字典转模型
1.定义字典
2.定义模型属性
3.定义个长整型来接受模型的属性的个数 count
4.定义属性列表ivar
5.for循环遍历进行给模型属性赋值
6.转换成OC字符串
7. 截取字符串从第一个字符串开始截取
8.进行KVC给模型赋值

  //遍历属性 ,
   //底层 runtime

    NSDictionary dict =@{@"name" :@"mingyuexin" ,@"age" :@18 ,@"height" :@1.8};

    CZPerson person = [[CZPersonalloc]init];

    //字典转模型用字典中的 key对应的值赋值给跟这个key一样的属性
    //遍历模型哪些属性?
    unsignedint count =0;

    Ivar ivar = class_copyIvarList([CZPersonclass], &count);


    //char a[10] = 'hello';
    //数组名称是常量指针
    for (int i = 0; i < count; ++i) {
        Ivar v = ivar[i];
        constchar ivarName = ivar_getName(v);
        NSLog(@"%@",[NSStringstringWithCString:ivarNameencoding:NSUTF8StringEncoding]);
        //传换成C字符串
        NSString str = [NSStringstringWithCString:ivarNameencoding:NSUTF8StringEncoding];
        NSLog(@"%@",str);
        //截取字符串
        str = [str substringFromIndex:1];
       //KVX模型赋值
        [person setValue:dict[str]forKey:str];

    }
  1. 交换方法实现

#import"UIImage+XL.h"
#import <objc/runtime.h>
@implementation UIImage (XL)
//当前类被加载的时候执行一次
+(void)load
{
//我们交换的就是这个两个方法
   //imageWithName
   //imageNamed
   Method m1 =class_getClassMethod([UIImageclass],@selector(imageWithName:));
    Method m2 =class_getClassMethod([UIImageclass],@selector(imageNamed:));

    //交换方法想当于你调用了自己方法其实调用的别人的.
    method_exchangeImplementations(m1, m2);

}
+ (instancetype)imageWithName:(NSString )name
{
    NSMutableString str = [NSMutableStringstringWithString:name];
    UIImage newImage =nil;
    if ([[UIDevicecurrentDevice].systemVersionfloatValue] >8.0) {
        [str appendString:@"_os8"];
        newImage = [UIImageimageWithName:str];

    }else{
        newImage = [UIImageimageWithName:name];
    }

    if (newImage ==nil) {
        newImage = [UIImageimageWithName:name];
    }
   return newImage;
}
3.实现数组越界了一样不会蹦,,交换方法实现,

#import"NSMutableArray+XL.h"
#import <objc/runtime.h>
@implementation NSMutableArray (XL)
//当前类被加载的时候执行一次
+(void)load
{


    Method m1 =class_getInstanceMethod(NSClassFromString(@"__NSArrayM"),@selector(addObject:));
    Method m2 =class_getInstanceMethod(NSClassFromString(@"__NSArrayM"),@selector(cz_addobjc:));
    //交换方法实现
    method_exchangeImplementations(m2, m1);

}
//执行方法
- (void)cz_addobjc:(id)objc
{
    if (objc ==nil) {
        [selfcz_addobjc:@"你个傻X"];
    }else{
        [selfcz_addobjc:objc];
    }

}

NSMutableArray *array = [NSMutableArrayarray];

    [array addObject:@"111"];

    //添加一个空对象
    [array addObject:nil];

    [array addObject:@"222"];

    NSLog(@"%@",array);
    //数组越界

//    NSLog(@"%@",array[5]);

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