NSLog（@“％@”，NSStringFromCGRect（[（UIButton *）[array lastObject] frame]））;

Question

NSLog(@" %@",NSStringFromCGRect([(UIButton*)[array lastObject]frame]));

此声明中的错误是什么。我的代码破了  错误 [__NSArrayI frame]：无法识别的选择器发送到实例0x1c5f2e00

Answer 1

检查此代码

UIButton *btn = (UIButton *)[array lastObject];

if(btn)
{

  NSLog(@" %@",NSStringFromCGRect(btn.frame));
}