（一）自定义alert控件，有取消和确定两个按钮，分别定义了- (void)clickLeftButton:(UIButton *)leftButton inView:(UIView *)inView;和- (void)clickRightButton:(UIButton *)rightButton inView:(UIView *)inView（必须实现）;
#import@protocol ITTAlertViewDelegate - (void)clickRightButton:(UIButton *)rightButton inView:(UIView *)inView;@optional- (void)clickLeftButton:(UIButton *)leftButton inView:(UIView *)inView;- (void)clcikCloseButton:(UIButton *)closeButton inView:(UIView *)inview;@end@interface ITTAlertView : UIView@property (nonatomic,strong) id delegate;@property (nonatomic,strong) UILabel *lblContent;@property (nonatomic,strong) UILabel *lblTitle;/** * 初始化ITTAlertView */- (instancetype)initWithFrame:(CGRect)frame Title:(NSString *)title content:(NSString *)contentStringleftButtonTitle:(NSString *)leftButtonTitle rightButtonTitle:(NSString *)rightButtonTitle;/** * 显示ITTAlertView */- (void)showAlertView;- (void)setAlertContentColor:(UIColor *)color font:(CGFloat)fontSize;- (void)setAlertTitleColor:(UIColor *)color;@end
（二）title的高度固定，而content的高度随文字长度自适应；
#import "ITTAlertView.h"#define kAlertWidth 260#define kAlertHeight 220#define kColor [UIColor colorWithRed:0 green:160.0f/255 blue:223.0f/255 alpha:1.0]#define kPhone @"400-6918-322"@interface ITTAlertView (){ UIView *alert; CGRect mainFrame; CGFloat alertHieght;}@property (nonatomic,strong) UIView *backImageView;@end@implementation ITTAlertView#define kTitleYOffset 15.0f#define kTitleTopOffset 20.0f#define kTitleHeight 20.0f#define kContentOffset 15.0f#define kBetweenLabelOffset 20.0f#define kContentHeight 90.0f#define kContentTopOffset 15.0f/** * 初始化ITTAlertView */- (instancetype)initWithFrame:(CGRect)frame Title:(NSString *)title content:(NSString *)contentString leftButtonTitle:(NSString *)leftButtonTitle rightButtonTitle:(NSString *)rightButtonTitle{ self = [super initWithFrame:frame]; if (self) { [self initAlertViewFrame]; self.lblTitle = [[UILabel alloc] initWithFrame:CGRectMake(kTitleYOffset, kTitleTopOffset, kAlertWidth - 2 * kTitleYOffset, kTitleHeight)]; self.lblTitle.text = title; self.lblTitle.font = [UIFont systemFontOfSize:15.0f]; self.lblTitle.textColor = kColor; self.lblTitle.textAlignment = NSTextAlignmentCenter; [alert addSubview:self.lblTitle]; self.lblContent = [[UILabel alloc] initWithFrame:CGRectMake(kTitleYOffset, kTitleTopOffset + kTitleHeight + kContentTopOffset, kAlertWidth - 2 * kTitleYOffset, kContentHeight)]; self.lblContent.text = contentString; self.lblContent.font = [UIFont systemFontOfSize:13.0f]; CGFloat height = [self.lblContent.text boundingRectWithSize:CGSizeMake(kAlertWidth - 2 * kTitleYOffset, MAXFLOAT) options:NSStringDrawingUsesFontLeading | NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.lblContent.font} context:nil].size.height; CGRect newFrame = self.lblContent.frame; newFrame.size.height = height; self.lblContent.frame = newFrame; self.lblContent.numberOfLines = 0; self.lblContent.textAlignment = NSTextAlignmentCenter; [alert addSubview:self.lblContent]; if (leftButtonTitle){ CGFloat width = (kAlertWidth - 2*kTitleYOffset - kBetweenLabelOffset)/2; UIButton *leftButton = [[UIButton alloc] initWithFrame:CGRectMake(kTitleYOffset, CGRectGetMaxY(_lblContent.frame)+kContentTopOffset, width, 30.0f)]; [leftButton setTitle:leftButtonTitle forState:UIControlStateNormal]; [leftButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [leftButton setBackgroundColor:kColor]; [leftButton addTarget:self action:@selector(clickLeftButton:) forControlEvents:UIControlEventTouchUpInside]; [alert addSubview:leftButton]; UIButton *rightButton = [[UIButton alloc] initWithFrame:CGRectMake(CGRectGetMaxX(leftButton.frame) + kTitleYOffset, CGRectGetMaxY(_lblContent.frame)+kContentTopOffset, width, 30.0f)]; [rightButton setTitle:rightButtonTitle forState:UIControlStateNormal]; [rightButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [rightButton setBackgroundColor:kColor]; [rightButton addTarget:self action:@selector(clickRightButton:) forControlEvents:UIControlEventTouchUpInside]; [alert addSubview:rightButton]; alertHieght = CGRectGetMaxY(rightButton.frame)+kTitleTopOffset; }else { UIButton *rightButton = [[UIButton alloc] initWithFrame:CGRectMake(kTitleYOffset, CGRectGetMaxY(_lblContent.frame)+kContentTopOffset, kAlertWidth - 2 * kTitleYOffset, 30.0f)]; [rightButton setTitle:rightButtonTitle forState:UIControlStateNormal]; [rightButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [rightButton setBackgroundColor:kColor]; [rightButton addTarget:self action:@selector(clickRightButton:) forControlEvents:UIControlEventTouchUpInside]; [alert addSubview:rightButton]; alertHieght = CGRectGetMaxY(rightButton.frame)+kTitleTopOffset; } //重新设置alert的高度，以及center； [self alertAutoHeight]; } return self;}//设置ITTAlertView的frame- (void)initAlertViewFrame{ self.frame = [self mainScreenFrame]; self.opaque = YES; self.backgroundColor = [UIColor clearColor]; [self makeBackgroundView]; [self makeAlertPopupView];}//创建背景view，并设置相关的属性- (void)makeBackgroundView{ self.backImageView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds]; self.backImageView.backgroundColor = [UIColor blackColor]; self.backImageView.alpha = 0.6f; [self addSubview:self.backImageView];}/** * 显示ITTAlertView */- (void)showAlertView{ [[UIApplication sharedApplication].keyWindow addSubview:self]; [self showAlertSpring];}//创建alertView- (void)makeAlertPopupView{ CGRect frame = CGRectMake(0, 0, kAlertWidth, kAlertHeight); CGRect screen = [self mainScreenFrame]; alert = [[UIView alloc]initWithFrame:frame]; alert.center = CGPointMake(CGRectGetWidth(screen) / 2, CGRectGetHeight(screen) / 2); alert.layer.masksToBounds = YES; alert.backgroundColor = [UIColor colorWithWhite:1.0f alpha:1.0f]; alert.layer.cornerRadius = 6.0f; [self addSubview:alert];}- (void)alertAutoHeight{ CGRect screen = [self mainScreenFrame]; CGRect frame = alert.frame; frame.size.height = alertHieght; alert.frame = frame; alert.center = CGPointMake(CGRectGetWidth(screen) / 2, CGRectGetHeight(screen) / 2);}//设置view的初始位置#pragma mark - View Animation Methods- (void)moveAlertPopupView{ CGRect screen = [self mainScreenFrame]; CATransform3D move = CATransform3DIdentity; CGFloat initAlertViewYPosition = (CGRectGetHeight(screen) + CGRectGetHeight(alert.frame)) / 2; move = CATransform3DMakeTranslation(0, -initAlertViewYPosition, 0); move = CATransform3DRotate(move, M_PI / 180, 0, 0, 1.0f); alert.layer.transform = move;}//alert左右摇摆动画- (void)showAlertShake{ CATransform3D leftShake = CATransform3DMakeTranslation(-2.0f, 0.0f, 0.0f); leftShake = CATransform3DRotate(leftShake, -2.0f * M_PI / 180, 0, 0, 1.0f); CATransform3D rightShake = CATransform3DMakeTranslation(2.0f, 0.0f, 0.0f); rightShake = CATransform3DRotate(rightShake, 2.0f * M_PI / 180, 0, 0, 1.0f); alert.layer.transform = leftShake; [UIView animateWithDuration:0.05f delay:0.0f options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat animations:^{ [UIView setAnimationRepeatCount:3.0f]; alert.layer.transform = rightShake; } completion:^(BOOL finished) { if (finished) { CATransform3D move = CATransform3DIdentity; alert.layer.transform = move; } }];}//弹出动画，带弹跳效果，弹跳系数1.0 -- 越接近0弹跳效果越强- (void)showAlertSpring{ CAKeyframeAnimation *keyAnima = [CAKeyframeAnimation animationWithKeyPath:@"transform"]; keyAnima.duration = 0.4f; keyAnima.values = @[ [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.01f, 0.01f, 1.0f)], [NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1f, 1.1f, 1.0f)], [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9f, 0.9f, 1.0f)], [NSValue valueWithCATransform3D:CATransform3DIdentity] ]; keyAnima.keyTimes = @[@0.2f, @0.5f, @0.75f, @1.0f]; keyAnima.timingFunctions = @[ [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut] ]; [alert.layer addAnimation:keyAnima forKey:nil];}//从窗口移除view并附带动画- (void)removeFromSuperview{ [UIView animateWithDuration:0.4f animations:^{ alert.alpha = 0; }]; CAKeyframeAnimation *keyAnima = [CAKeyframeAnimation animationWithKeyPath:@"transform"]; keyAnima.duration = 0.4f; keyAnima.values = @[ [NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1f, 1.1f, 1.0f)], [NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0f, 1.0f, 1.0f)], [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.0f, 0.0f, 1.0f)] ]; keyAnima.keyTimes = @[@0.2f, @0.5f, @0.75f]; keyAnima.timingFunctions = @[ [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut] ]; keyAnima.delegate = self; [alert.layer addAnimation:keyAnima forKey:nil];}//蒙版frame- (CGRect)mainScreenFrame{ return [UIScreen mainScreen].bounds;}- (void)clickRightButton:(UIButton *)sender{ [self removeFromSuperview]; if (self.delegate && [self.delegate respondsToSelector:@selector(clickRightButton:inView:)]){ [self.delegate clickRightButton:sender inView:self]; }}- (void)clickLeftButton:(UIButton *)sender{ [self removeFromSuperview]; if (self.delegate && [self.delegate respondsToSelector:@selector(clickLeftButton:inView:)]){ [self.delegate clickLeftButton:sender inView:self]; }}- (void)clickCloseButton:(UIButton *)sender{ [self removeFromSuperview]; if (self.delegate && [self.delegate respondsToSelector:@selector(clcikCloseButton:inView:)]){ [self.delegate clcikCloseButton:sender inView:self]; }}//设置阴影- (void)setShadowStyle:(UIButton *)currentButton{ currentButton.layer.shadowOffset = CGSizeMake(1, 1); currentButton.layer.shadowOpacity = 0.6f; currentButton.layer.shadowRadius = 0.5f;}- (void)setAlertTitleColor:(UIColor *)color{ _lblTitle.textColor = color;}- (void)setAlertContentColor:(UIColor *)color font:(CGFloat)fontSize{ NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:_lblContent.text]; [attributeString addAttribute:NSForegroundColorAttributeName value:color range:[_lblContent.text rangeOfString:kPhone]]; [attributeString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:fontSize] range:[_lblContent.text rangeOfString:kPhone]]; _lblContent.attributedText = attributeString;}- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{ [self.backImageView removeFromSuperview]; self.backImageView = nil; [super removeFromSuperview];}@end
（三）总结
一个比较常规、中规中矩的alert自定义控件，旨在于学习自定义控件的效果和简单的动画，并不涉及很深的技术。