我想为每个创建的按钮提出一种不同的方法.
我尝试在viewDidLoad中调用“First Image”方法,但它不起作用.
我尝试在viewDidLoad中调用“First Image”方法,但它不起作用.
我在ViewDidLoad中的选择器有问题.没有识别“FirstImage”,这是一个没有参数的void方法.
ViewController.m
- (void)createFirstButton:(NSString *)myName: (SEL *)myAction{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn addTarget:self
action:@selector(myAction)
forControlEvents:UIControlEventTouchUpInside];
[btn setTitle:myName forState:UIControlStateNormal];
btn.frame = CGRectMake(20,916,120,68);
[self.view addSubview:btn];
}
- (void)viewDidLoad{
[self createFirstButton:@"First" myAction:[self FirstImage]];
}
我做了什么(我将“CreateFirstButton”更改为“CreateButton”)：
ViewControler.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize myHeight;
@synthesize myWidth;
@synthesize myX;
@synthesize myY;
- (void)createButton:(NSString *)myName:(SEL)myAction:(NSUInteger)my_x:(NSUInteger)my_y:(NSUInteger)my_width:(NSUInteger)my_height
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn addTarget:self
action:myAction
forControlEvents:UIControlEventTouchUpInside];
[btn setTitle:myName forState:UIControlStateNormal];
btn.frame = CGRectMake(my_x,my_y,my_width,my_height);
[self.view addSubview:btn];
}
- (void)myXcrementation{
myX = myX + 150;
}
- (void)viewDidLoad{
myX = 20; myY = 916; myWidth = 120; myHeight = 68;
[self createButton:@"First":@selector(FirstImage):myX:myY:myWidth:myHeight];
[self myXcrementation];
[self createButton:@"PrevIoUs":@selector(PrevIoUsImage):myX:myY:myWidth:myHeight];
[self myXcrementation];
[self createButton:@"Pause":@selector(PauseImage):myX:myY:myWidth:myHeight];
[self myXcrementation];
[self createButton:@"Next":@selector(NextImage):myX:myY:myWidth:myHeight];
[self myXcrementation];
[self createButton:@"Last":@selector(LastImage):myX:myY:myWidth:myHeight];
}
- (void)FirstImage{
current = 0;
[self SetImage];
}
-(void)SetImage{
[myImageView setImage: [myArray objectAtIndex:(current)]];
}
@end
ViewController.h
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController{
}
@property(assign,nonatomic) NSUInteger myHeight;
@property(assign,nonatomic) NSUInteger myWidth;
@property(assign,nonatomic) NSUInteger myX;
@property(assign,nonatomic) NSUInteger myY;
@end
我再次编辑了这个帖子,没有更多的错误.
特别感谢大家.花了我时间了解:)
解决方法
你必须使用@selector,如下所示
[self createFirstButton:@"First" myAction:@selector(FirstImage)];
那么你的签名是错误的,因为SEL不应该是一个指针.
更改
- (void)createFirstButton:(NSString *)myName: (SEL *)myAction{
至
- (void)createFirstButton:(NSString *)myName: (SEL)myAction{
最后,myAction的类型为SEL,因此可以直接将其传递给UIButton方法,如下所示
[btn addTarget:self
action:myAction
forControlEvents:UIControlEventTouchUpInside];
此外,我想补充说,使用大写字母的方法,这是一个非常糟糕的做法.
