如何檢查是否可以使用NSError從包中讀取圖像？

Question

我需要檢查，如果圖像讀取..我有這樣的代碼：

[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]; 
} 
...... 
} 

，我想補充NSError這個代碼...我怎麼能確定我的圖像將負荷而不應用會崩潰？ （使用NSError） 10x

Answer 1

檢查下面的代碼

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"); 
    } 
} 

Answer 2

檢查imageNamed:是否返回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]; 
    } 
}