objective-c 语言数组遍历的4种方式_objective-c 遍历数组-优快云博客

objective-c 语言数组遍历的4种方式：1、普通for循环；2、快速for循环；3、特性block方法；4、枚举方法。

Blog类：

 
#import "Blog.h"
 
@implementation Blog
 
 
 
+(Blog *)blog{
 
    Blog * blog = [[Blog alloc] init];
 
    return blog;
 
}
 
 
 
-(Blog *)setBlogTitle:(NSString *)title andContent:(NSString *)content{
 
    _title = title;
 
    _content = content;
 
    return self;
 
}
 
 
 
-(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：

 
#pragma mark Array数组的四种遍历方法
 
void testArray(){
 
    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
 
    long int count = [array count];
 
    for (int i = 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
 
    int i = 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;
 
    int j = 0 ;
 
    while (obj = [en nextObject]) {
 
        NSLog(@"5遍历array：%d-->%@",j,obj);
 
        j++;
 
    }
 
}
 
int main(int argc, const char * argv[])
 
{
 
    @autoreleasepool {
 
        testArray();
 
    }
 
    return 0;
 
}