setValue:forUndefinedKey: this class is not key value coding-compliant for the key(setValue:forUndefinedKey: 这个类不符合键的键值编码)

Round two corners in UIView(UIView中的圆两个角)

quot;unrecognized selector sent to instancequot; error in Objective-C(“发送到实例的无法识别的选择器Objective-C 中的错误)

Programmatically turn on bluetooth in the iphone sdk?(以编程方式在 iphone sdk 中打开蓝牙?)

What exactly is a so called quot;Class Clusterquot; in Objective-C?(究竟什么是所谓的“类集群?在Objective-C中?)

Dot notation vs. message notation for declared properties(声明属性的点表示法与消息表示法)

Black bars showing when running app on iOS 7 (4 inch retina display)(在 iOS 7 上运行应用程序时显示黑条(4 英寸视网膜显示屏))

Does the APNS device token ever change, once created?(APNS 设备令牌是否会在创建后更改?)

What is the Swift equivalent of respondsToSelector?(respondsToSelector 的 Swift 等价物是什么?)

@property retain, assign, copy, nonatomic in Objective-C(@property 在 Objective-C 中保留、分配、复制、非原子)

What kind of leaks does automatic reference counting in Objective-C not prevent or minimize?(Objective-C 中的自动引用计数不能防止或最小化什么样的泄漏?)

Zooming MKMapView to fit annotation pins?(缩放 MKMapView 以适应注释图钉?)

File is universal (three slices), but it does not contain a(n) ARMv7-s slice error for static libraries on iOS, anyway to bypass?(文件是通用的(三个切片)，但它不包含 iOS 上静态库的(n)ARMv7-s 切片错误，无论如何要绕过?)

Resize UIImage by keeping Aspect ratio and width(通过保持纵横比和宽度调整 UIImage 的大小)

Deep copying an NSArray(深拷贝一个 NSArray)

Combine static libraries on Apple(在 Apple 上合并静态库)

How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?(您如何在延迟后触发块，例如 -performSelector:withObject:afterDelay:?)

Core Data: Quickest way to delete all instances of an entity(核心数据:删除实体所有实例的最快方法)

Objective-C for Windows(用于 Windows 的 Objective-C)

Remove all but numbers from NSString(从 NSString 中删除除数字之外的所有数字)