objective-c数组的七种遍历方法总结

//第一种

[arr enumerateObjectsUsingBlock: ^(id obj, NSUInteger idx, BOOL *stop){

    NSLog(@"%ld,%@",idx,[arr objectAtIndex:idx]);

}];

//第二种

dispatch_apply([arr count], dispatch_get_global_queue(0, 0), ^(size_t index){//并行

    NSLog(@"%ld,%@",index,[arr objectAtIndex:index]);

});

//第三种

dispatch_apply([arr count], dispatch_get_main_queue(), ^(size_t index){//串行，容易引起主线程堵塞，可以另外开辟线程

    NSLog(@"%ld,%@",index,[arr objectAtIndex:index]);

});

//第四种

for (NSString*str in arr) {

     NSLog(@"%@",str);

}

//第五种，do-while

int i = 0;

do {

    NSLog(@"%@",[arr objectAtIndex:i]);

    i++;

} while (i<[arr count]);

 

//第六种，while-do

int j = 0;

while (j<[arr count]) {

    NSLog(@"%@",[arr objectAtIndex:j]);

    j++;

}

//第七种，普通for循环

for (int m = 0; m<[arr count]; m++) {

    NSLog(@"%@",[arr objectAtIndex:m]);

}