Question

我有一个简单的iPhone应用程序，允许用户将图像上传到服务器。问题是，如果他们上传大图像文件会怎么样。我想将其限制为（最大）200 KB。我开始了一些事情，但似乎在while声明中崩溃了。

以下是代码：

NSString *jpgPath = [NSString stringWithFormat:@"Documents/%@",sqlImageUploadPathTwo];
NSString *jpgPathTwo = [NSString stringWithFormat:@"./../Documents/%@",sqlImageUploadPathTwo];
NSString *yourPath = [NSHomeDirectory() stringByAppendingPathComponent:jpgPath];

NSLog(@"yourPath: %@", yourPath);

NSFileManager *man = [[NSFileManager alloc] init];
NSDictionary *attrs = [man attributesOfItemAtPath: yourPath error: NULL];
int *result = [attrs fileSize];
NSLog(@"Here's the original size: %d", result);

NSLog(@"jpgPath: %@ // jpgPathTwo: %@", jpgPath, jpgPathTwo);

while (result > 9715) {
    UIImage *tempImage = [UIImage imageNamed: jpgPath];
    NSData *imageData = [NSData dataWithData:UIImageJPEGRepresentation(tempImage, 0.9)];
    [imageData writeToFile:jpgPathTwo atomically:YES];
    NSLog(@"just shrunk it once.");
}

NSLog(@"SIZE AFTER SHRINK: %@", result);

谢谢！
库尔顿

Answer 1

这样的事情：（另请注意，您将结果声明为int *（即指针），而不是数字，条件应为＆gt;，而不是＆lt;（对于大文件，它根本不会更改它们。）还有一个额外的计数器条件对于避免无限循环很有用（基本上做5次然后停止这样做，无论大小如何）。

NSFileManager *man = [[NSFileManager alloc] init];
NSDictionary *attrs = [man attributesOfItemAtPath: yourPath error: NULL];
int result = [attrs fileSize];
int count = 0;
while (result > 9715 && count < 5) {
    UIImage *tempImage = [UIImage imageNamed: jpgPath];
    NSData *imageData = [NSData dataWithData:UIImageJPEGRepresentation(tempImage, 0.9)];
    [imageData writeToFile:jpgPathTwo atomically:YES];
    NSDictionary *attrs = [man attributesOfItemAtPath: jpgPathTwo error: NULL];
    result = [attrs fileSize];
    count++;
    NSLog(@"just shrunk it once.");
}

压缩图像文件大小（iPhone）？

1 个答案: