解析code4app上自定义AlerView（开源学习）

/*感谢来自开源Code4App的demo DXAlertView，来让我学到了很多*//*好了我们开始看看他们是怎么实现自己的demo的呢  呵呵*/

</pre><pre name="code" class="objc">DXAlerView.h@interface DXAlertView : UIView/*创建alerview上面的信息以及button*/- (id)initWithTitle:(NSString *)title        contentText:(NSString *)content    leftButtonTitle:(NSString *)leftTitle   rightButtonTitle:(NSString *)rigthTitle;/*将以创建好的CustomAlerView进行显示在window上*/- (void)show;/*dispatch_block_t  定义一个返回为空的block typedef void (^dispatch_block_t)(void);*/@property (nonatomic, copy) dispatch_block_t leftBlock;@property (nonatomic, copy) dispatch_block_t rightBlock;@property (nonatomic, copy) dispatch_block_t dismissBlock;@end@interface UIImage (colorful)/*将UIColor转化为UIImage*/+ (UIImage *)imageWithColor:(UIColor *)color;@end

DXAlerView.m#define kAlertWidth 245.0f#define kAlertHeight 160.0f@interface DXAlertView (){    BOOL _leftLeave;}@property (nonatomic, strong) UILabel *alertTitleLabel;@property (nonatomic, strong) UILabel *alertContentLabel;@property (nonatomic, strong) UIButton *leftBtn;@property (nonatomic, strong) UIButton *rightBtn;@property (nonatomic, strong) UIView *backImageView;@end@implementation DXAlertView+ (CGFloat)alertWidth{    return kAlertWidth;}+ (CGFloat)alertHeight{    return kAlertHeight;}- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}#define kTitleYOffset 15.0f#define kTitleHeight 25.0f#define kContentOffset 30.0f#define kBetweenLabelOffset 20.0f/*创建显示的控件*/- (id)initWithTitle:(NSString *)title        contentText:(NSString *)content    leftButtonTitle:(NSString *)leftTitle   rightButtonTitle:(NSString *)rigthTitle{    if (self = [super init]) {                        self.layer.cornerRadius = 5.0;        self.backgroundColor = [UIColor whiteColor];        self.alertTitleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, kTitleYOffset, kAlertWidth, kTitleHeight)];        self.alertTitleLabel.font = [UIFont boldSystemFontOfSize:20.0f];        self.alertTitleLabel.textColor = [UIColor colorWithRed:56.0/255.0 green:64.0/255.0 blue:71.0/255.0 alpha:1];        [self addSubview:self.alertTitleLabel];                CGFloat contentLabelWidth = kAlertWidth - 16;        self.alertContentLabel = [[UILabel alloc] initWithFrame:CGRectMake((kAlertWidth - contentLabelWidth) * 0.5, CGRectGetMaxY(self.alertTitleLabel.frame), contentLabelWidth, 60)];        self.alertContentLabel.numberOfLines = 0;        self.alertContentLabel.textAlignment = self.alertTitleLabel.textAlignment = NSTextAlignmentCenter;        self.alertContentLabel.textColor = [UIColor colorWithRed:127.0/255.0 green:127.0/255.0 blue:127.0/255.0 alpha:1];        self.alertContentLabel.font = [UIFont systemFontOfSize:15.0f];        [self addSubview:self.alertContentLabel];                CGRect leftBtnFrame;        CGRect rightBtnFrame;#define kSingleButtonWidth 160.0f#define kCoupleButtonWidth 107.0f#define kButtonHeight 40.0f#define kButtonBottomOffset 10.0f        if (!leftTitle) {            rightBtnFrame = CGRectMake((kAlertWidth - kSingleButtonWidth) * 0.5, kAlertHeight - kButtonBottomOffset - kButtonHeight, kSingleButtonWidth, kButtonHeight);            self.rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];            self.rightBtn.frame = rightBtnFrame;                    }else {            leftBtnFrame = CGRectMake((kAlertWidth - 2 * kCoupleButtonWidth - kButtonBottomOffset) * 0.5, kAlertHeight - kButtonBottomOffset - kButtonHeight, kCoupleButtonWidth, kButtonHeight);            rightBtnFrame = CGRectMake(CGRectGetMaxX(leftBtnFrame) + kButtonBottomOffset, kAlertHeight - kButtonBottomOffset - kButtonHeight, kCoupleButtonWidth, kButtonHeight);            self.leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];            self.rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];            self.leftBtn.frame = leftBtnFrame;            self.rightBtn.frame = rightBtnFrame;        }                [self.rightBtn setBackgroundImage:[UIImage imageWithColor:[UIColor colorWithRed:87.0/255.0 green:135.0/255.0 blue:173.0/255.0 alpha:1]] forState:UIControlStateNormal];        [self.leftBtn setBackgroundImage:[UIImage imageWithColor:[UIColor colorWithRed:227.0/255.0 green:100.0/255.0 blue:83.0/255.0 alpha:1]] forState:UIControlStateNormal];        [self.rightBtn setTitle:rigthTitle forState:UIControlStateNormal];        [self.leftBtn setTitle:leftTitle forState:UIControlStateNormal];        self.leftBtn.titleLabel.font = self.rightBtn.titleLabel.font = [UIFont boldSystemFontOfSize:14];        [self.leftBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];        [self.rightBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];                [self.leftBtn addTarget:self action:@selector(leftBtnClicked:) forControlEvents:UIControlEventTouchUpInside];        [self.rightBtn addTarget:self action:@selector(rightBtnClicked:) forControlEvents:UIControlEventTouchUpInside];        self.leftBtn.layer.masksToBounds = self.rightBtn.layer.masksToBounds = YES;        self.leftBtn.layer.cornerRadius = self.rightBtn.layer.cornerRadius = 3.0;        [self addSubview:self.leftBtn];        [self addSubview:self.rightBtn];                self.alertTitleLabel.text = title;        self.alertContentLabel.text = content;                UIButton *xButton = [UIButton buttonWithType:UIButtonTypeCustom];        [xButton setImage:[UIImage imageNamed:@"btn_close_normal.png"] forState:UIControlStateNormal];        [xButton setImage:[UIImage imageNamed:@"btn_close_selected.png"] forState:UIControlStateHighlighted];        xButton.frame = CGRectMake(kAlertWidth - 32, 0, 32, 32);        [self addSubview:xButton];        [xButton addTarget:self action:@selector(dismissAlert) forControlEvents:UIControlEventTouchUpInside];                self.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleTopMargin;    }    return self;}- (void)leftBtnClicked:(id)sender{    _leftLeave = YES;    [self dismissAlert];    if (self.leftBlock) {        self.leftBlock();    }}- (void)rightBtnClicked:(id)sender{    _leftLeave = NO;    [self dismissAlert];    if (self.rightBlock) {        self.rightBlock();    }}/*显示在window上面*/- (void)show{    UIView *topVC = [self appRootWindow];    [topVC addSubview:self];}- (void)dismissAlert{    [self removeFromSuperview];    if (self.dismissBlock) {        self.dismissBlock();    }}/*返回当前的程序的主窗口UIWindow*/- (UIView *)appRootWindow{    return [UIApplication sharedApplication].keyWindow;}/*UIView原生的接口 在从父视图移除是调用  进行动画移除 */- (void)removeFromSuperview{    [self.backImageView removeFromSuperview];    self.backImageView = nil;    UIView *topVC = [self appRootWindow];    CGRect afterFrame = CGRectMake((CGRectGetWidth(topVC.bounds) - kAlertWidth) * 0.5, CGRectGetHeight(topVC.bounds), kAlertWidth, kAlertHeight);        [UIView animateWithDuration:0.35f delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^{        self.frame = afterFrame;        if (_leftLeave) {            self.transform = CGAffineTransformMakeRotation(-M_1_PI / 1.5);        }else {            self.transform = CGAffineTransformMakeRotation(M_1_PI / 1.5);        }    } completion:^(BOOL finished) {        [super removeFromSuperview];    }];}/*UIView 原生的接口 在将要进入父视图的时候   在这里进行动画移入*/- (void)willMoveToSuperview:(UIView *)newSuperview{    if (newSuperview == nil) {        return;    }    UIView *topVC = [self appRootWindow];    if (!self.backImageView) {        self.backImageView = [[UIView alloc] initWithFrame:topVC.bounds];        self.backImageView.backgroundColor = [UIColor blackColor];        self.backImageView.alpha = 0.6f;        self.backImageView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;    }    [topVC addSubview:self.backImageView];    self.transform = CGAffineTransformMakeRotation(-M_1_PI / 2);    CGRect afterFrame = CGRectMake((CGRectGetWidth(topVC.bounds) - kAlertWidth) * 0.5, (CGRectGetHeight(topVC.bounds) - kAlertHeight) * 0.5, kAlertWidth, kAlertHeight);    [UIView animateWithDuration:0.35f delay:0.0 options:UIViewAnimationOptionCurveEaseIn animations:^{        self.transform = CGAffineTransformMakeRotation(0);        self.frame = afterFrame;    } completion:^(BOOL finished) {    }];    [super willMoveToSuperview:newSuperview];}@end@implementation UIImage (colorful)/*color 转化为image */+ (UIImage *)imageWithColor:(UIColor *)color{    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();        CGContextSetFillColorWithColor(context, [color CGColor]);    CGContextFillRect(context, rect);        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();        return image;}