使用代理和block写一个alertView

代理：

MyAlertView.h:
@property (nonatomic,assign)id      delegate;

@protocol MyAlertViewDelegate <NSObject>

- (void)myAlertView:(MyAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;

@end

MyAlertView.m:
- (void)buttonClick:(id)sender
{
    UIButton *button = (UIButton *)sender;
    int index = (int)button.tag - ;

    if ([self.delegate respondsToSelector:@selector(myAlertView:clickedButtonAtIndex:)]) {
        [self.delegate myAlertView:self clickedButtonAtIndex:index];
    }
    [self disappear];
}

调用处ViewController：
- (void)myAlertView:(MyAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
     NSLog(@"buttonIndex:%d",buttonIndex);
}

使用block：

MyAlertView.h:

//使用copy 而不是retain ，因为block 变量是声明在栈上的，retain之后还是在栈上，方法结束，栈的内存就被系统自动释放，copy 可以把一个block 变量从栈上拷贝到堆上，堆上的内存由引用计数管理，所以我们就能自己决定block的释放。
@property (nonatomic,copy)void (^buttonClick)(int);

MyAlertView.m:
- (void)buttonClick:(id)sender
{
    UIButton *button = (UIButton *)sender;
    int index = (int)button.tag - ;

    self.buttonClick(index);

    [self disappear];
}

调用处ViewController：
    alertView.buttonClick = ^(int index){
        NSLog(@"buttonIndex:%d",buttonIndex);
    };

UILabel类别自适应高度

#import <UIKit/UIKit.h>

@interface UILabel (AutoFitSize)

+(UILabel *)getInfoLabel:(UILabel *)label withText:(NSString *)ktext withFont:(UIFont *)kfont withtosize:(CGRect)krect withBackGroundColor:(UIColor *)kbackgroundColor;

@end

#import "UILabel+AutoFitSize.h"

//判断是否是IOS7以上的系统（包含IOS7）
#define bIos7 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0?YES : NO)

@implementation UILabel (AutoFitSize)

#if __IPHONE_OS_VERSION_MAX_ALLOWED < 70000

+(UILabel *)getInfoLabel:(UILabel *)label withText:(NSString *)ktext withFont:(UIFont *)kfont withtosize:(CGRect)krect withBackGroundColor:(UIColor *)kbackgroundColor
{
    label.font=kfont;
    label.text = ktext;
    label.textColor = [UIColor blackColor];
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor=kbackgroundColor;

    label.numberOfLines=;
    label.lineBreakMode=NSLineBreakByTruncatingTail;
    //内容显示  高度自适应
    CGSize sizeToFit =[ktext sizeWithFont:font constrainedToSize:CGSizeMake(krect.size.width,)lineBreakMode:NSLineBreakByWordWrapping];
    label.frame=CGRectMake(krect.origin.x,krect.origin.y,sizeToFit.width, sizeToFit.height);;
    return label;
}

#else

+(UILabel *)getInfoLabel:(UILabel *)label withText:(NSString *)ktext withFont:(UIFont *)kfont withtosize:(CGRect)krect withBackGroundColor:(UIColor *)kbackgroundColor
{
    label.text = ktext;
    label.font = kfont;
    label.textColor = [UIColor blackColor];
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor = kbackgroundColor;

    label.numberOfLines =;
    label.lineBreakMode =NSLineBreakByTruncatingTail ;
    //高度估计文本大概要显示几行，宽度根据需求自己定义。 MAXFLOAT 可以算出具体要多高
    CGSize size =CGSizeMake(krect.size.width,);
    NSDictionary * tdic = [NSDictionary dictionaryWithObjectsAndKeys:kfont,NSFontAttributeName,nil];
    //ios7方法，获取文本需要的size，限制宽度
    CGSize  actualsize =[ktext boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin  attributes:tdic context:nil].size;
    label.frame=CGRectMake(krect.origin.x,krect.origin.y,actualsize.width, actualsize.height);

    return label;
}

#endif

@end

代码地址：http://pan.baidu.com/s/1hqAKp3u