Incompatible pointer types assigning to 'id<>' from 'Class'错误

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Incompatible pointer types assigning to 'id<>' from 'Class'错误

实例变量在类方法中被使用原因:静态方法访问了非静态变量属性(.h中声明的那些属性),就是类方法访问了成员变量…

iOS Assigning to 'id<XXXDelegate>' from incompatible type 'BViewController *__strong'

在使用代理的时候, BViewController *BVC = [[BViewController alloc]init]; self.delegate = BVC; 出现这样的警告Assigning to 'id<XXXDelegate>' from incompatible type 'BViewController *__strong' 解决方案: #import "BViewController.h" @interface BViewController ()&l…

block中出现此种报错： Incompatible block pointer types initializing 'float (^__strong)(float, float)' with an expression of type 'int (^)(float, float)'

当block(代码块)的返回值是float时,应注意的地方:定义的返回值类型一定要与return的返回值类型一样我们以两个数的四则运算来举例在main.m文件中的四则运算中,我采用两种返回值类型(int 与 float)相互对照. #import <Foundation/Foundation.h> void fun1(int(^block)(int a,int b)){ block(,); } void fun2(float(^block)(float a,float b)){ block…

Assigning to 'id<UINavigationControllerDelegate,UIImagePickerControllerDelegate> _Nullable' from incompatible type 'InfchangeVC *const __strong'

出现 Assigning to 'id<UINavigationControllerDelegate,UIImagePickerControllerDelegate>' from incompatible type 'ManageMessageViewController' 警告当调用UIImagePickerController时,在进行委托定义是提示Assigning to 'id<UINavigationControllerDelegate,UIImagePickerContro…