Objective c 带NSData但不带大小的UIImage

我有以下代码：

...
NSData * dimage = [[NSData alloc]initWithData:[datosImagen objectForKey:@"Image"]];
UIImage * imagenAMostrar = [[UIImage alloc] initWithData:dimage];
UIImageView * imAMostrar = [[UIImageView alloc] initWithImage:imagenAMostrar];
...

我需要调整UIImageView的大小，类似于以下尺寸：

setFrame:CGRectMake（0,60320240）

。 但为此，我需要UIImageView大小

NSLog(@" Image width:%d",imagenAMostrar.size.width);
NSLog(@" Image height:%d",imagenAMostrar.size.height);

结果是：

2011-10-03 13:32:28.993 Catalogo-V1[2679:207] Image width:0
2011-10-03 13:32:28.994 Catalogo-V1[2679:207] Image height:0

---

为什么？您应该得到一个转换类型警告<代码>宽度和高度是

float-s

。您应该使用

%f

作为转换说明符。你应该像这样打印它们

NSLog(@" Image width:%f", imagenAMostrar.size.width);
NSLog(@" Image height:%f", imagenAMostrar.size.height);

imAMostrar.frame = CGRectMake(0, 60, imagenAMostrar.size.width, imagenAMostrar.size.height);

您可以这样设置图像视图的框架

NSLog(@" Image width:%f", imagenAMostrar.size.width);
NSLog(@" Image height:%f", imagenAMostrar.size.height);

imAMostrar.frame = CGRectMake(0, 60, imagenAMostrar.size.width, imagenAMostrar.size.height);

---

您在NSLog语句中没有收到任何警告吗？您应该得到一个转换类型警告<代码>宽度和高度是

float-s

。您应该使用

%f

作为转换说明符。你应该像这样打印它们

NSLog(@" Image width:%f", imagenAMostrar.size.width);
NSLog(@" Image height:%f", imagenAMostrar.size.height);

imAMostrar.frame = CGRectMake(0, 60, imagenAMostrar.size.width, imagenAMostrar.size.height);

您可以这样设置图像视图的框架

NSLog(@" Image width:%f", imagenAMostrar.size.width);
NSLog(@" Image height:%f", imagenAMostrar.size.height);

imAMostrar.frame = CGRectMake(0, 60, imagenAMostrar.size.width, imagenAMostrar.size.height);

---

如果（[UIImage imageWithData:dimage]）不忽略警告，它们会帮助您。您可以先检查图像对象是否创建，如果（[UIImage imageWithData:dimage]）不忽略警告，它们会帮助您。