iOS开发-项目中减少if-else 的使用

大概是受够了if-else,特意去网上找了资料，参考了很多资料，现在自己做一个总结。

 /** 表驱动 */
    NSArray *arr = @[
        @{
          //跳转类名
            @"classname":@"OneViewController",
            @"testIndex":[NSString stringWithFormat:@"%ld",indexPath.row],
            @"name":@"这是我的名字，哈哈哈",
        },
    @{
             //跳转类名
               @"classname":@"TwoViewController",
               @"index":@"bian",
           },
    ];
    NSDictionary *keyDic = arr[indexPath.row];
    if (keyDic) {
        [FBRuntime runtimePush:keyDic[@"classname"] dic:keyDic nav:self.navigationController];
     }

看了上面的代码很简单吧，现在主要是来说说[FBRuntime runtimePush:keyDic[@"classname"] dic:keyDic nav:self.navigationController];
如果不需要带参数的跳转，其实看前面的代码就可以，如果需要带参数，那就要考虑runtime，自己写了一个类，现在源码贴上.

#import <Foundation/Foundation.h>
#import "AppDelegate.h"

NS_ASSUME_NONNULL_BEGIN

@interface FBRuntime : NSObject

+ (void)runtimePush:(NSString *)vcName dic:(NSDictionary *)dic nav:(UINavigationController *)nav;


+ (BOOL)checkIsExistPropertyWithInstance:(id)instance verifyPropertyName:(NSString *)verifyPropertyName;

@end

NS_ASSUME_NONNULL_END

//
//  FBRuntime.m
#import "FBRuntime.h"
#import <objc/runtime.h>
#import "AppDelegate.h"

@implementation FBRuntime

//runtime跳转

+ (void)runtimePush:(NSString *)vcName dic:(NSDictionary *)dic nav:(UINavigationController *)nav {
    //类名(对象名)
    
    NSString *class = vcName;
    
    const char *className = [class cStringUsingEncoding:NSASCIIStringEncoding];
    Class newClass = objc_getClass(className);
    if (!newClass) {
        //创建一个类
        Class superClass = [NSObject class];
        newClass = objc_allocateClassPair(superClass, className, 0);
        //注册你创建的这个类
        objc_registerClassPair(newClass);
    }
    // 创建对象(写到这里已经可以进行随机页面跳转了)
    id instance = [[newClass alloc] init];
    
    //下面是传值－－－－－－－－－－－－－－
    
    [dic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        if ([self checkIsExistPropertyWithInstance:instance verifyPropertyName:key]) {
            //kvc给属性赋值
            
            [instance setValue:obj forKey:key];
        }else {
            NSLog(@"不包含key=%@的属性",key);
        }
    }];
    [nav pushViewController:instance animated:YES];
    
}
/**
 *  检测对象是否存在该属性
 */
+ (BOOL)checkIsExistPropertyWithInstance:(id)instance verifyPropertyName:(NSString *)verifyPropertyName
{
    unsigned int outCount, i;
    
    // 获取对象里的属性列表
    objc_property_t * properties = class_copyPropertyList([instance
                                                           class], &outCount);
    
    for (i = 0; i < outCount; i++) {
        objc_property_t property =properties[i];
        //  属性名转成字符串
        NSString *propertyName = [[NSString alloc] initWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
        // 判断该属性是否存在
        if ([propertyName isEqualToString:verifyPropertyName]) {
            free(properties);
            return YES;
        }
    }
    free(properties);
    
    return NO;
}



@end

参考链接