背景是博主偷懒依然用了iOS8后被废弃掉的UIAlertView，然后取消的字体比确定要粗，同时为了统一界面风格，需要把UIAlertView统一换成定制的样子，博主就犯难了，又不想大批量更改代码，怎么办，突然意识到为什么我不能自己写一个类似系统的方法呢，只要整体代码一样，不就可以通过搜索统一修改一下类名就好了么？说干就干，这里贴上代码：
#import <UIKit/UIKit.h> @class MyAlertView; @protocol MyAlertDelegate <NSObject> -(void)alertView:(MyAlertView *)alertView clickedButtonAtIndex:(NSUInteger)buttonIndex; @end @interface MyAlertView : UIView @property (weak,nonatomic) id<MyAlertDelegate>delegate; -(instancetype)initWithTitle:title message:messge delegate:delegate cancelButtonTitle:cancelTitle otherButtonTitle:otherTitle; -(void)show; @end
#import "MyAlertView.h" #define WIDTH [UIApplication sharedApplication].keyWindow.frame.size.width #define HEIGHT [UIApplication sharedApplication].keyWindow.frame.size.height @interface MyAlertView() @property(nonatomic,strong)UIView *blackView; @property(nonatomic,strong)UIView *alertBackView; @property(nonatomic,strong)UILabel *contentLabel; @property(nonatomic,strong)UIButton *cancelBtn; @property(nonatomic,strong)UIButton *okBtn; @property(nonnull,strong)NSString *title; @property(nonnull,strong)NSString *content; @property(nonnull,strong)NSString *cancelBtnTitle; @property(nonnull,strong)NSString *okBtnTitle; @end @implementation MyAlertView -(instancetype)initWithTitle:title message:messge delegate:delegate cancelButtonTitle:cancelTitle otherButtonTitle:otherTitle { if (self=[super initWithFrame:[[UIApplication sharedApplication] keyWindow].frame]) { _delegate=delegate; _title=title; _content=messge; _cancelBtnTitle=cancelTitle; _okBtnTitle=otherTitle; [self setUp]; } return self; } -(void)setUp { NSLog(@"%f",WIDTH); NSLog(@"%f",HEIGHT); //黑色背景 _blackView=[[UIView alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)]; _blackView.backgroundColor=[UIColor blackColor]; _blackView.alpha=0.6; [self addSubview:_blackView]; //弹出框背景 _alertBackView=[[UIView alloc]initWithFrame:CGRectMake(20, 44, WIDTH-40, 160)]; _alertBackView.layer.cornerRadius=6; _alertBackView.center=CGPointMake(320/2, 568/2); _alertBackView.backgroundColor=[UIColor whiteColor]; [self addSubview:_alertBackView]; //标题 UILabel *alertTitle=[[UILabel alloc]initWithFrame:CGRectMake(20, 10, WIDTH-40-40, 20)]; alertTitle.text=_title; alertTitle.textAlignment=NSTextAlignmentCenter; alertTitle.textColor=[UIColor colorWithRed:0.31f green:0.31f blue:0.31f alpha:1.00f]; alertTitle.font=[UIFont systemFontOfSize:15]; [_alertBackView addSubview:alertTitle]; //消息内容 UILabel *message=[[UILabel alloc]initWithFrame:CGRectMake(20, 30, WIDTH-40-40, 60)]; message.text=_content; message.numberOfLines=0; message.textAlignment=NSTextAlignmentCenter; message.textColor=[UIColor colorWithRed:0.31f green:0.31f blue:0.31f alpha:1.00f]; message.font=[UIFont systemFontOfSize:15]; [_alertBackView addSubview:message]; // CAKeyframeAnimation * animation; // animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"]; // animation.duration = 0.5; // animation.delegate = self; // animation.removedOnCompletion = YES; // animation.fillMode = kCAFillModeForwards; // // NSMutableArray *values = [NSMutableArray array]; // [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1, 0.1, 1.0)]]; // [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1, 1.1, 1.0)]]; // [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9, 0.9, 0.9)]]; // [values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]]; // // animation.values = values; // [_alertBackView.layer addAnimation:animation forKey:nil]; //按钮背景 UIView *btnBGView=[[UIView alloc]initWithFrame:CGRectMake(0, 100, WIDTH-40, 60)]; btnBGView.backgroundColor=[UIColor colorWithRed:0.96f green:0.96f blue:0.96f alpha:1.00f]; [_alertBackView addSubview:btnBGView]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:btnBGView.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(3, 3)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = btnBGView.bounds; maskLayer.path = maskPath.CGPath; btnBGView.layer.mask = maskLayer; if (_cancelBtnTitle==nil||_okBtnTitle==nil) { //确定按钮 _okBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; _okBtn.frame=CGRectMake((WIDTH-40-220)/2, 15, 220, 30); _okBtn.titleLabel.font=[UIFont systemFontOfSize:15]; [_okBtn setTitle:_cancelBtnTitle==nil ? _okBtnTitle:_cancelBtnTitle forState:UIControlStateNormal]; [_okBtn setBackgroundImage:[UIImage imageNamed:@"login_loginbtn.png"] forState:UIControlStateNormal]; [_okBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; _okBtn.tag=1; [_okBtn addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; [btnBGView addSubview:_okBtn]; } else { //取消按钮 _cancelBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; _cancelBtn.frame=CGRectMake(25, 15,100, 30); _cancelBtn.titleLabel.font=[UIFont systemFontOfSize:15]; [_cancelBtn setTitle:_cancelBtnTitle forState:UIControlStateNormal]; [_cancelBtn setBackgroundImage:[UIImage imageNamed:@"detail_alert_left"] forState:UIControlStateNormal]; [_cancelBtn setTitleColor:[UIColor colorWithRed:0.47f green:0.47f blue:0.47f alpha:1.00f] forState:UIControlStateNormal]; _cancelBtn.tag=0; [_cancelBtn addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; [btnBGView addSubview:_cancelBtn]; //确定按钮 _okBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; _okBtn.frame=CGRectMake(WIDTH-40-25-100, 15, 100, 30); _okBtn.titleLabel.font=[UIFont systemFontOfSize:15]; [_okBtn setTitle:_okBtnTitle forState:UIControlStateNormal]; [_okBtn setBackgroundImage:[UIImage imageNamed:@"detail_alert_right"] forState:UIControlStateNormal]; [_okBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; _okBtn.tag=1; [_okBtn addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; [btnBGView addSubview:_okBtn]; } } -(void)buttonAction:(UIButton *)btn { if ([self.delegate respondsToSelector:@selector(alertView:clickedButtonAtIndex:)]) { [self.delegate alertView:self clickedButtonAtIndex:(btn.tag)]; } self.alpha = 0.0; [self removeFromSuperview]; _blackView=nil; _alertBackView=nil; } -(void)show { UIView * keywindow = [[UIApplication sharedApplication] keyWindow]; [keywindow addSubview:self]; }
原谅我没写很多注释，不过我觉得大家都能看得懂，我并没有写的很复杂。这里需要注意的问题是，怎么把自己的alert添加到控制器上来显示，添加是简单，可是像系统那样，不在调用时设置frame和利用控制器addSubView怎么实现呢？博主一开始纠结了好久，不过最后算是写出来了，参考的小伙伴要认真看下，还有代理的实现步骤，需要格外注意下哦，代码中注释部分为动画效果，自定义alert弹出时不会像系统的那样直接让当前键盘收回，如果有键盘时触发，键盘有可能会遮挡到当前alert，需要在触发时手动对键盘resignFirstResponder。其他的博主就不详细说明了，代码中有体现。附上github下载地址：https://github.com/codeliu6572/CustomAlertView
