如何检查是否可以使用NSError从捆绑读取图像？

Question

我需要检查是否读取了图像。我有以下代码：

[self setView];
-(void)setView{

for(int i = self.firstNumberOfImages; i <= self.lastNumberOfImages; i++)
{
    UIImage* image = [UIImage imageNamed:[NSString stringWithFormat:@"%@%d.%@",self.imageName,i,self.imageType]];
    NSLog(@"%d",i);
    [imgArray addObject:image];
}
......
}

并且我想将NSError添加到此代码中...如何确定我的图像将被加载而不导致应用程序崩溃？ （使用NSError ）10x

Answer 1

检查imageNamed:返回nil 。

for(int i = self.firstNumberOfImages; i <= self.lastNumberOfImages; i++)
{
    UIImage* image = [UIImage imageNamed:[NSString 
                     stringWithFormat:@"%@%d.%@",self.imageName,i,self.imageType]];
    NSLog(@"%d",i);
    if (image) {
        [imgArray addObject:image];
    }
}

Answer 2

检查以下代码

for(int i = self.firstNumberOfImages; i <= self.lastNumberOfImages; i++)
{
    UIImage* image = [UIImage imageNamed:[NSString 
                     stringWithFormat:@"%@%d.%@",self.imageName,i,self.imageType]];
    NSLog(@"%d",i);
    @try{
        [imgArray addObject:image];
    }
    @catch(exception e)
     {
        NSLog(@"ERROR");
    }
}