21、objective-c数组的四种遍历方法总结

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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;}

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