xcode 在 NSImageView 上设置图像
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Setting an image on NSImageView
提问by Pedro Vieira
I'm having a problem with my program. Basically what i want is, i have 2 nssecuretextfield and i have a button. if both are equal, it shows one image on the nsimageview, if not it displays other image. This could be very easy, but i'm new to mac programming,
我的程序有问题。基本上我想要的是，我有 2 nssecuretextfield 和我有一个按钮。如果两者相等，则在 nsimageview 上显示一张图像，否则显示另一张图像。这可能很容易，但我是 mac 编程的新手，
the .h file:
.h 文件：
IBOutlet NSSecureTextField *textField;
IBOutlet NSSecureTextField *textField2;
IBOutlet NSImageView *imagem;
}
- (IBAction)Verificarpass:(id)sender;
the .m file:
.m 文件：
- (IBAction)Verificarpass:(id)sender;
{
NSString *senha1 = [textField stringValue];
NSString *senha2 = [textField2 stringValue];
NSImage *certo;
NSImage *errado;
certo = [NSImage imageNamed:@"Status_Accepted.png"];
errado = [NSImage imageNamed:@"Error.png"];
if (senha1 == senha2) {
[imagem setImage:certo];
}
if (senha1 != senha2) {
[imagem setImage:errado];
}
}
can anyone help me please? i tried and it only displays 1 image, even if its right or wrong.
有人可以帮我吗？我试过了，它只显示 1 张图像，即使它是对的或错的。
回答by Yuji
You can't compare the contents of strings via ==or !=. That compares the pointer values (i.e. the address where the string object lives.)
您无法通过==或比较字符串的内容!=。比较指针值（即字符串对象所在的地址。）
Use
用
if ([senha1 isEqualToString:senha2]) {
[imagem setImage:certo];
}else{
[imagem setImage:errado];
}
instead.
反而。
Another unrelated advice: never start a method name with a capital letter. That's against Cocoa convention. Use verificarPassinstead.
另一个不相关的建议：永远不要以大写字母开头方法名称。这违反了 Cocoa 公约。使用verificarPass来代替。
