黑马程序员------Objective-C------数组遍历方法总结

来源：互联网发布：imf数据库使用指南编辑：程序博客网时间：2024/06/06 23:56

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#import "Blog.h"
@implementation Blog
 
+(Blog *)blog{
    Blog * blog = [[Blog alloc] init];
    returnblog;
}
 
-(Blog *)setBlogTitle:(NSString *)title andContent:(NSString *)content{
    _title = title;
    _content = content;
    returnself;
}
 
-(NSString *)description{
    return[NSString stringWithFormat:@"blog : title is \"%@\" , and content is \"%@\"", _title,_content ];
}
 
-(void)dealloc{
    NSLog(@"%@被销毁了",self.title);
}
@end

主函数：

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#pragma mark Array数组的四种遍历方法
voidtestArray(){
    Blog *blog1 = [[Blog blog] setBlogTitle:@"Love"andContent:@"I love you"];
    Blog *blog2 = [[Blog blog] setBlogTitle:@"Friendship"andContent:@"you are my best friend"];
    NSArray *array = [NSArray arrayWithObjects:@"hello",@"world",blog1,blog2, nil];
     
    //第一种遍历：普通for循环
    longintcount = [array count];
    for(inti = 0 ; i < count; i++) {
        NSLog(@"1遍历array: %zi-->%@",i,[array objectAtIndex:i]);
    }
     
    //第二种遍历：快速for循环,需要有外变量i
    inti = 0;
    for(id obj in array) {
        NSLog(@"2遍历array：%zi-->%@",i,[array objectAtIndex:i]);
        i++;
    }
     
    //第三种遍历：OC自带方法enumerateObjectsUsingBlock:
     
    //默认为正序遍历
    [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL*stop) {
        NSLog(@"3遍历array：%zi-->%@",idx,obj);
    }];
    //NSEnumerationReverse参数为倒序遍历
    [array enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx,BOOL*stop) {
        NSLog(@"4倒序遍历array：%zi-->%@",idx,obj);
    }];
     
    //第四种遍历：利用枚举
    NSEnumerator *en = [array objectEnumerator];
    id obj;
    intj = 0 ;
    while(obj = [en nextObject]) {
        NSLog(@"5遍历array：%d-->%@",j,obj);
        j++;
    }
}
intmain(intargc,constchar* argv[])
{
    @autoreleasepool {
        testArray();
    }
    return0;
}

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