iphone memory management

Question

1.UIImageView *img1=[[UIImageView alloc]initwithImage:[UIImage imageNamed:@"1.png"]];

2.UIImageView *img2=[[UIImageView alloc]initwithImage:[UIImage imageNamed:@"2.png"]];

a) img1.image = [UIImage imageNamed:@"2.png"];

b) [img1 setImage:img2];

which way utilizes minimum memory among a and b?why?

if i need to do this multiple times which way you suggest?

Answer 1

b）因为您正在创建对现有对象的引用，但是它们都将指向“ 2.png”。在a）中，您正在创建对象的新实例，该对象恰巧指向同一文件，但是已分配了该文件作为单独的内存空间。