以下代码,在Objective-C中是一个很好的编程实践吗?
#import "Custom.h"
@interface Custom ()
@property (nonatomic, retain) UILabel *label;
@end
@implementation Custom
@synthesize label;
- (void) dealloc {
[label release];
[super dealloc];
}
@end
Run Code Online (Sandbox Code Playgroud) 有没有有效的方法将NSDate转换为RFC 2822日期格式字符串?我想使用此字符串创建NSURLRequest并设置"If-Modified-Since"标题字段的值.
我想将GillSans-Bold字体添加到UILabel.我已经在xib文件中设置了它,我也在我的课堂中设置它,如下所示:
[label setFont:[UIFont fontWithName:@"GillSans-Bold" size:18]];
Run Code Online (Sandbox Code Playgroud)
但是,它似乎对我不起作用.有什么建议 ?
protocol BasePresenterProtocol : class {}
protocol DashboardPresenterProtocol : BasePresenterProtocol {}
final class DashboardPresenter {
weak var view: DashboardPresenterProtocol?
init() {
self.view = DashboardViewController()
}
func test() {
print("Hello")
}
}
extension DashboardPresenter: DashboardViewProtocol { }
protocol BaseViewProtocol : class {
weak var view: BasePresenterProtocol? { get set }
}
protocol DashboardViewProtocol : BaseViewProtocol {
}
class DashboardViewController {
}
extension DashboardViewController: DashboardPresenterProtocol { }
Run Code Online (Sandbox Code Playgroud)
在上面的代码中,我在下一行收到错误
extension DashboardPresenter: DashboardViewProtocol { }
Run Code Online (Sandbox Code Playgroud)
那个,DashboardPresenter不向协议确认DashboardViewProtocol,但我已经宣布weak var view: DashboardPresenterProtocol?了 …