ISO開(kāi)發(fā)學(xué)習(xí)之路--第一篇--圖像顯示器制作（1）

    項(xiàng)目主要工作，能夠通過(guò)按鈕按進(jìn)行翻上一張和下一張對(duì)相片就行查看功能。這項(xiàng)目有點(diǎn)簡(jiǎn)單，但是是學(xué)習(xí)的必經(jīng)過(guò)程。對(duì)學(xué)習(xí)的整理和參考。

主要目的：

1）熟悉3大控件的使用方法和規(guī)則

2）熟悉3大控件的編程方法

3）熟悉ISO開(kāi)發(fā)技巧

下面是今天學(xué)習(xí)內(nèi)容的源碼，這部分源碼實(shí)現(xiàn)的有點(diǎn)羅嗦，后期會(huì)改成，后來(lái)會(huì)用plist的方式和應(yīng)用數(shù)組的方式，簡(jiǎn)化實(shí)現(xiàn)圖片顯示的方法。

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UILabel *iLabel;

@property (nonatomic, strong) UIImageView *iImage;

@property (nonatomic, strong) UILabel *idesLabel;

@property (nonatomic, strong) UIButton *leftButton;

@property (nonatomic, strong) UIButton *rightButton;

@property (nonatomic, assign) int index;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    /*標(biāo)簽*/

    self.iLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, 40)];

    self.iLabel.textAlignment = NSTextAlignmentCenter;

    [self.view addSubview:_iLabel];

    /*顯示圖片*/

    CGFloat Image_W = 300;

    CGFloat Image_H = 300;

    CGFloat Image_X = (self.view.frame.size.width - Image_W) *0.5;

    CGFloat Image_Y = CGRectGetMaxY(self.iLabel.frame) + 20;

    self.iImage = [[UIImageView alloc]initWithFrame:CGRectMake(Image_X, Image_Y, Image_W, Image_H)];

    self.iImage.p_w_picpath = [UIImage p_w_picpathNamed:@"biaoqingdi"];

    [self.view addSubview:_iImage];

    /*顯示左右按鈕*/

    self.leftButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];

    self.leftButton.center = CGPointMake(CGRectGetMinX(self.iImage.frame) * 0.5, (CGRectGetMinY(self.iImage.frame) + self.iImage.frame.size.height* 0.5));

    [_leftButton setImage:[UIImage p_w_picpathNamed:@"left_normal"] forState:UIControlStateNormal];

    [_leftButton setImage:[UIImage p_w_picpathNamed:@"left_highlighted"] forState:UIControlStateHighlighted];

    _leftButton.tag = -1;

    [self.view addSubview:_leftButton];

    [_leftButton addTarget:self action:@selector(leftAction) forControlEvents:UIControlEventTouchUpInside];

    self.rightButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];

    self.rightButton.center = CGPointMake((CGRectGetMaxX(self.iImage.frame) + self.leftButton.center.x), (CGRectGetMinY(self.iImage.frame) + self.iImage.frame.size.height* 0.5));

    [_rightButton setImage:[UIImage p_w_picpathNamed:@"right_normal"] forState:UIControlStateNormal];

    _rightButton.tag = 1;

    [_rightButton setImage:[UIImage p_w_picpathNamed:@"right_highlighted"] forState:UIControlStateHighlighted];

    [self.view addSubview:_rightButton];

    [_rightButton addTarget:self action:@selector(rightAction) forControlEvents:UIControlEventTouchUpInside];

    /*描述內(nèi)容*/

    self.idesLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(self.iImage.frame) + 30, self.view.frame.size.width, 20)];

    self.idesLabel.textAlignment = NSTextAlignmentCenter;

    [self.view addSubview:_idesLabel];

    [self buttonAction:nil];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void) buttonAction :(UIButton *) Button

{

    NSLog(@"%s", __func__);

    self.index += (int)Button.tag;

    /*顯示索引*/

    self.iLabel.text = [NSString stringWithFormat:@"%d/%d", self.index + 1, 5];

    switch (self.index)

    {

        case 0:

            self.iImage.p_w_picpath  = [UIImage p_w_picpathNamed:@"biaoqingdi"];

            self.idesLabel.text = @"表情帝";

            break;

        case 1:

            self.iImage.p_w_picpath = [UIImage p_w_picpathNamed:@"bingli"];

            self.idesLabel.text = @"病例表";

            break;

        case 2:

            self.iImage.p_w_picpath = [UIImage p_w_picpathNamed:@"chiniupa"];

            self.idesLabel.text = @"吃牛排";

            break;

        case 3:

            self.iImage.p_w_picpath = [UIImage p_w_picpathNamed:@"danteng"];

            self.idesLabel.text = @"蛋疼";

            break;

        case 4:

            self.iImage.p_w_picpath = [UIImage p_w_picpathNamed:@"wangba"];

            self.idesLabel.text = @"王八";

            break;

        default:

            break;

    }

}

- (void) leftAction

{

    [self buttonAction: _leftButton];

    _leftButton.enabled = (self.index != 0);

    _rightButton.enabled = (self.index != 4);

}

- (void) rightAction

{

    [self buttonAction:_rightButton];

    _leftButton.enabled = (self.index != 0);

    _rightButton.enabled = (self.index != 4);

}

@end

總結(jié)：

1）如果是幾個(gè)按鈕的話， 可以通過(guò)+-1的方式利用tag進(jìn)行，簡(jiǎn)化明了。

2）uibutton和其他的控件應(yīng)用不一樣

3）在代碼中多想下代碼重復(fù)利用怎么處理能使代碼更加簡(jiǎn)單！