自定义的AlertView，可以选择出现的动画方式，特意做了几个可以对比。没啥难点，直接上代码，一看就懂。
1.在YYTAlertView.h文件中
//
// YYTAlertView.h
// Demo-自定义alertView
//
// Created by yyt on 16/4/19.
// Copyright © 2016年 yyt. All rights reserved.
//
#import <UIKit/UIKit.h>
typedef NS_ENUM(NSInteger , ShowAnimationStyle) {
AnimationDefault = 0,
AnimationLeftShake ,
AnimationTopShake ,
AnimationNO ,
};
typedef void(^AlertClickIndexBlock)(NSInteger clickIndex);
@interface YYTAlertView : UIView
@property (nonatomic,copy) AlertClickIndexBlock clickBlock;
@property (nonatomic,assign) ShowAnimationStyle animationStyle;
- (instancetype)initWithTitle:(NSString *)title AndMessage:(NSString *)message AndCancelBtnTitle:(NSString *)cancelTitle AndOtherBtnTitle:(NSString *)otherBtnTitle AndClickIndexBlock:(AlertClickIndexBlock)block;
-(void)showAlertView;
@end
2.在YYTAlertView.m文件中
//
// YYTAlertView.m
// Demo-自定义alertView
//
// Created by yyt on 16/4/19.
// Copyright © 2016年 yyt. All rights reserved.
//
#import "YYTAlertView.h"
#define MainScreenRect [UIScreen mainScreen].bounds
#define AlertView_W 270.0f
@interface YYTAlertView ()
@property (nonatomic,strong)UIWindow *alertWindow;
@property (nonatomic,strong)UIView *alertView;
@property (nonatomic,strong)UILabel *titleLab;
@property (nonatomic,strong)UILabel *messageLab;
@property (nonatomic,strong)UIButton *cancelBtn;
@property (nonatomic,strong)UIButton *otherBtn;
@end
@implementation YYTAlertView
- (instancetype)initWithTitle:(NSString *)title AndMessage:(NSString *)message AndCancelBtnTitle:(NSString *)cancelTitle AndOtherBtnTitle:(NSString *)otherBtnTitle AndClickIndexBlock:(AlertClickIndexBlock)block{
if(self=[super init]){
self.frame = MainScreenRect;
self.backgroundColor=[UIColor colorWithWhite:.3 alpha:.7];
_alertView=[[UIView alloc] init];
_alertView.backgroundColor=[UIColor whiteColor];
_alertView.layer.cornerRadius=6.0;
_alertView.layer.masksToBounds=YES;
_alertView.userInteractionEnabled=YES;
if (title) {
_titleLab=[[UILabel alloc] initWithFrame:CGRectMake(0, 10, AlertView_W, 20)];
_titleLab.text=title;
_titleLab.textAlignment=NSTextAlignmentCenter;
_titleLab.textColor=[UIColor blackColor];
_titleLab.font=[UIFont systemFontOfSize:17];
}
_messageLab=[[UILabel alloc] init];
_messageLab.backgroundColor=[UIColor whiteColor];
_messageLab.text=message;
_messageLab.textColor=[UIColor lightGrayColor];
_messageLab.textAlignment=NSTextAlignmentCenter;
_messageLab.font=[UIFont systemFontOfSize:14];
_messageLab.numberOfLines=0;
CGRect rectOfText = CGRectMake(20, _titleLab.frame.size.height+_titleLab.frame.origin.y+10, AlertView_W-40, 999);
rectOfText = [_messageLab textRectForBounds:rectOfText limitedToNumberOfLines:0];
_messageLab.frame = rectOfText;
//计算_alertView的高度
_alertView.frame=CGRectMake(0, 0, AlertView_W, _messageLab.frame.size.height+90);
_alertView.center=self.center;
[self addSubview:_alertView];
[_alertView addSubview:_titleLab];
[_alertView addSubview:_messageLab];
if (cancelTitle) {
_cancelBtn=[UIButton buttonWithType:UIButtonTypeCustom];
[_cancelBtn setTitle:cancelTitle forState:UIControlStateNormal];
[_cancelBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[_cancelBtn setBackgroundColor:[UIColor lightGrayColor]];
_cancelBtn.titleLabel.font=[UIFont systemFontOfSize:15];
_cancelBtn.layer.cornerRadius=3;
_cancelBtn.layer.masksToBounds=YES;
[_cancelBtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[_alertView addSubview:_cancelBtn];
}
if (otherBtnTitle) {
_otherBtn=[UIButton buttonWithType:UIButtonTypeCustom];
[_otherBtn setTitle:otherBtnTitle forState:UIControlStateNormal];
[_otherBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
_otherBtn.titleLabel.font=[UIFont systemFontOfSize:15];
_otherBtn.layer.cornerRadius=3;
_otherBtn.layer.masksToBounds=YES;
[_otherBtn setBackgroundColor:[UIColor redColor]];
[_otherBtn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[_alertView addSubview:_otherBtn];
}
CGFloat btnLeftSpace = 40;//btn到左边距
CGFloat btn_y = _alertView.frame.size.height-40;
if (cancelTitle && !otherBtnTitle) {
_cancelBtn.tag=0;
_cancelBtn.frame=CGRectMake(btnLeftSpace, btn_y, AlertView_W-btnLeftSpace*2, 30);
}else if (!cancelTitle && otherBtnTitle){
_otherBtn.tag=0;
_otherBtn.frame=CGRectMake(btnLeftSpace, btn_y, AlertView_W-btnLeftSpace*2, 30);
}else if (cancelTitle && otherBtnTitle){
_cancelBtn.tag=0;
_otherBtn.tag=1;
CGFloat btnSpace = 20;//两个btn之间的间距
CGFloat btn_w =(AlertView_W-btnLeftSpace*2-btnSpace)/2;
_cancelBtn.frame=CGRectMake(btnLeftSpace, btn_y, btn_w, 30);
_otherBtn.frame=CGRectMake(_alertView.frame.size.width-btn_w-btnLeftSpace, btn_y, btn_w, 30);
}
self.clickBlock=block;
}
return self;
}
-(void)btnClick:(UIButton *)btn{
if (self.clickBlock) {
self.clickBlock(btn.tag);
}
[self dismissAlertView];
}
-(void)showAlertView{
_alertWindow=[[UIWindow alloc] initWithFrame:MainScreenRect];
_alertWindow.windowLevel=UIWindowLevelAlert;
[_alertWindow becomeKeyWindow];
[_alertWindow makeKeyAndVisible];
[_alertWindow addSubview:self];
[self setShowAnimation];
}
-(void)dismissAlertView{
[self removeFromSuperview];
[_alertWindow resignKeyWindow];
}
-(void)setShowAnimation{
switch (_animationStyle) {
case AnimationDefault:
{
[UIView animateWithDuration:0 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
[_alertView.layer setValue:@(0) forKeyPath:@"transform.scale"];
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.23 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
[_alertView.layer setValue:@(1.2) forKeyPath:@"transform.scale"];
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.09 delay:0.02 options:UIViewAnimationOptionCurveEaseInOut animations:^{
[_alertView.layer setValue:@(.9) forKeyPath:@"transform.scale"];
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.05 delay:0.02 options:UIViewAnimationOptionCurveEaseInOut animations:^{
[_alertView.layer setValue:@(1.0) forKeyPath:@"transform.scale"];
} completion:^(BOOL finished) {
}];
}];
}];
}];
}
break;
case AnimationLeftShake:{
CGPoint startPoint = CGPointMake(-AlertView_W, self.center.y);
_alertView.layer.position=startPoint;
//damping:阻尼，范围0-1，阻尼越接近于0，弹性效果越明显
//velocity:弹性复位的速度
[UIView animateWithDuration:.8 delay:0 usingSpringWithDamping:.5 initialSpringVelocity:1.0 options:UIViewAnimationOptionCurveEaseIn animations:^{
_alertView.layer.position=self.center;
} completion:^(BOOL finished) {
}];
}
break;
case AnimationTopShake:{
CGPoint startPoint = CGPointMake(self.center.x, -_alertView.frame.size.height);
_alertView.layer.position=startPoint;
//damping:阻尼，范围0-1，阻尼越接近于0，弹性效果越明显
//velocity:弹性复位的速度
[UIView animateWithDuration:.8 delay:0 usingSpringWithDamping:.5 initialSpringVelocity:1.0 options:UIViewAnimationOptionCurveEaseIn animations:^{
_alertView.layer.position=self.center;
} completion:^(BOOL finished) {
}];
}
break;
case AnimationNO:{
}
break;
default:
break;
}
}
-(void)setAnimationStyle:(ShowAnimationStyle)animationStyle{
_animationStyle=animationStyle;
}
@end
3.在需要的地方调用
//
// ViewController.m
// Demo-自定义alertView
//
// Created by yyt on 16/4/19.
// Copyright © 2016年 yyt. All rights reserved.
//
#import "ViewController.h"
#import "YYTAlertView.h"
#define klScreenWidth self.view.bounds.size.width
@interface ViewController ()<UIAlertViewDelegate>
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *button0 = [UIButton buttonWithType:UIButtonTypeCustom];
button0.frame = CGRectMake(20, 100, klScreenWidth-40, 40);
button0.backgroundColor = [UIColor orangeColor];
[button0 setTitle:@"systemAlertView" forState:UIControlStateNormal];
[button0 addTarget:self action:@selector(clickButton0:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button0];
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
button1.frame = CGRectMake(20, 160, klScreenWidth-40, 40);
button1.backgroundColor = [UIColor orangeColor];
[button1 setTitle:@"customAlertView1" forState:UIControlStateNormal];
[button1 addTarget:self action:@selector(clickButton1:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button1];
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeCustom];
button2.frame = CGRectMake(20, 220, klScreenWidth-40, 40);
button2.backgroundColor = [UIColor orangeColor];
[button2 setTitle:@"customAlertView2" forState:UIControlStateNormal];
[button2 addTarget:self action:@selector(clickButton2:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button2];
UIButton *button3 = [UIButton buttonWithType:UIButtonTypeCustom];
button3.frame = CGRectMake(20, 280, klScreenWidth-40, 40);
button3.backgroundColor = [UIColor orangeColor];
[button3 setTitle:@"customAlertView3" forState:UIControlStateNormal];
[button3 addTarget:self action:@selector(clickButton3:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button3];
}
- (void)clickButton0:(UIButton*)sender {
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"系统的AlertView" message:@"hehe" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
[alert show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
NSLog(@"系统alert==%ld",buttonIndex);
}
- (void)clickButton1:(UIButton*)sender {
YYTAlertView *alert=[[YYTAlertView alloc] initWithTitle:@"自定义AlertView1" AndMessage:@"默认缩放出现" AndCancelBtnTitle:@"取消" AndOtherBtnTitle:@"确定" AndClickIndexBlock:^(NSInteger clickIndex) {
NSLog(@"点击自定义AlertView1====%ld",clickIndex);
}];
[alert showAlertView];
}
- (void)clickButton2:(UIButton*)sender {
YYTAlertView *alert=[[YYTAlertView alloc] initWithTitle:@"自定义AlertView2" AndMessage:@"自顶部出现" AndCancelBtnTitle:@"取消" AndOtherBtnTitle:@"确定" AndClickIndexBlock:^(NSInteger clickIndex) {
NSLog(@"点击自定义AlertView2====%ld",clickIndex);
}];
alert.animationStyle = AnimationTopShake;
[alert showAlertView];
}
- (void)clickButton3:(UIButton*)sender {
YYTAlertView *alert=[[YYTAlertView alloc] initWithTitle:@"自定义AlertView3" AndMessage:@"从左边出现" AndCancelBtnTitle:@"取消" AndOtherBtnTitle:@"确定" AndClickIndexBlock:^(NSInteger clickIndex) {
NSLog(@"点击自定义AlertView3====%ld",clickIndex);
}];
alert.animationStyle = AnimationLeftShake;
[alert showAlertView];
}
@end
原文：http://www.cnblogs.com/yyt-hehe-yyt/p/5414861.html