我正在编写一些 Objective-C 代码,但我不知道为什么这不起作用:
buttonRect = CGRectMake(0,0,100.0,100.0);//error:incompatible types in assignment
CGRect newFrame = CGRectInset(buttonRect, -0.2, -0.2);//error:incompatible type for argument 1 of CGRectInset
button.frame = newFrame;
buttonRect 是在我的类中定义为实例变量的 CGRect,而 button 是 UIButton 也定义为实例变量。为什么这不起作用?我的头文件:
//
// MyViewController.h
// HelloWorld
//
// Created by RCIX on 7/10/09.
// Copyright 2009 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface MyViewController : UIViewController {
UITextField *textField;
UILabel *label;
NSString *string;
UIButton *button;
CGRect *buttonRect;
}
@property (nonatomic, assign) CGRect *buttonRect;
@property (nonatomic, retain) IBOutlet UITextField *textField;
@property (nonatomic, retain) IBOutlet UILabel *label;
@property (nonatomic, retain) IBOutlet UIButton *button;
@property (nonatomic, retain) NSString *string;
- (IBAction)helloButtonDown:(id)sender;
- (IBAction)helloButtonUp:(id)sender;
@end