懒加载中进行字典转模型

假设有一个flags.plist文件

ZWFlags.h

#import <Foundation/Foundation.h>
@interface ZWFlags : NSObject
/** 国旗名字 */
@property (strong, nonatomic)NSString *name;

/** 国旗图片 */
@property (strong, nonatomic)NSString *icon;

+ (instancetype)flagsWithDict:(NSDictionary *)dict;

@end

ZWFlags.m

#import "ZWFlags.h"
@interface ZWFlags()
@end
@implementation ZWFlags

+ (instancetype)flagsWithDict:(NSDictionary *)dict
{
    ZWFlags *flags = [[self alloc] init];   //此处的self不能用ZWFlags
    flags.name = dict[@"name"];
    flags.icon = dict[@"icon"];  //此处两句也可以直接写成[flags setValuesForKeysWithDictionary:dict]; 
    return flags;
}
@end

在需要使用的控制器中

#import "ViewController.h"
#import "ZWFlags.h"
/** 所有国旗的数据 */
@property (strong, nonatomic)NSMutableArray *flags;

@end

@implementation ViewController

- (NSMutableArray *)flags
{
    if (_flags == nil) {
        //装flag模型
        _flags =[NSMutableArray array];
//        加载plist数据
        NSString *path = [[NSBundle mainBundle] pathForResource:@"flags.plist" ofType:nil];
        NSArray *arr = [NSArray arrayWithContentsOfFile:path];
//        字典转模型
        for (NSDictionary *dict in arr) {
            ZWFlags *flag = [ZWFlags flagsWithDict:dict];
            [_flags addObject:flag];
        }
    }
    return _flags;
}

经常看到下面一种，不过上面的简单一些

#import "ViewController.h"
#import "ZWFlags.h"
/** 所有国旗的数据 */
@property (strong, nonatomic)NSArray *flags;

@end
@implementation ViewController

- (NSArray *)flags
{ 
    if (_flags == nil) {
        //加载plist文件
        NSString *path = [[NSBundle mainBundle] pathForResource:@"flags.plist" ofType:nil];
        NSArray *dictArr = [NSArray arrayWithContentsOfFile:path];
        
        //字典转模型
        NSMutableArray *flagArray = [NSMutableArray array];
        for (NSDictionary *dict in dictArr) {
            ZWFlags *flag = [ZWFlags flagsWithDict:dict];
            [flagArray addObject:flag];
        }
        _flags = flagArray;
    }
    return _flags;
}