替代方法

- (void)viewDidLoad {

[super viewDidLoad];

asdf = 0;

UIButton* but =[UIButton buttonWithType:UIButtonTypeContactAdd];

[self.view addSubview:but];

but.frame = CGRectMake(80, 120, 30, 30);

[but addTarget:self action:@selector(didTap:) forControlEvents:UIControlEventTouchUpInside];

}

- (void)didTap:(UIButton*)but{

NSArray* arr =@[@"2014",@"2015",@"2016"];

self.ast = arr;

NSInteger index;

for (int i = 0; i < arr.count; i++) {

if ([[NSString stringWithFormat:arr[asdf]] isEqualToString:arr[i]]) {

index = i;

break;//跳出for循环

}

}

asdf++;

NSLog(@"%ld",(long)index);

}

iOS 数组－－objectAtIndex的方法用于获取数组中的元素在数组中的下表，至于为什么我找一个替代方法是因为今天在Xcode7.3.1上面真机调试，一直抱这样的错，而且还导致程序崩溃，错误信息：warning: could not load any Objective-C class information from the dyld shared cache. This will significantly reduce the quality of type information available.。经查，这可能是Xcode7.3.1的一个错误，所以顺势找一个替代方法，实现条条大路通罗马，凡事都不能一棵树上吊死。