UIButton以及UITextField

#import "AppDelegate.h"

@interface AppDelegate ()

@property(nonatomic, retain)UITextField *textField;

@property(nonatomic, assign)BOOL isSelected;

@property(nonatomic, retain)UILabel *label;

@end

@implementation AppDelegate

- (void)dealloc
{
[self.window release];
[self.textField release];
[self.label release];
[super dealloc];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
[self.window release];

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
button.frame = CGRectMake(140, 300, 100, 100);
button.layer.cornerRadius = 3;
button.layer.borderWidth = 5;
[button setTitle:@"测试" forState:UIControlStateNormal];
[self.window addSubview:button];
[button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

self.textField = [[UITextField alloc] initWithFrame:CGRectMake(140, 100, 100, 40)];
self.textField.layer.borderWidth = 5;
self.textField.layer.cornerRadius = 3;
[self.window addSubview:self.textField];
[self.textField release];
self.textField.tag = 1000;

// 设置输入进去之后是圆点
self.textField.secureTextEntry = YES;

// 给textField添加addTarget-action方法
[self.textField addTarget:self action:@selector(changeValue:) forControlEvents:UIControlEventEditingChanged];

// 创建一个按钮,用来切换状态
UIButton *changePicButton = [UIButton buttonWithType:UIButtonTypeCustom];
changePicButton.frame = CGRectMake(50, 100, 100, 40);
[self.window addSubview:changePicButton];
[changePicButton setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
[changePicButton addTarget:self action:@selector(knock:) forControlEvents:UIControlEventTouchUpInside];
changePicButton.tag = 1001;
self.isSelected = YES;

self.label = [[UILabel alloc] initWithFrame:CGRectMake(120, 200, 140, 40)];
[self.window addSubview:self.label];
self.label.backgroundColor = [UIColor cyanColor];
[self.label release];

// 通过继承的方式对类进行扩展
MyButton *myButton = [MyButton buttonWithType:UIButtonTypeSystem];
myButton.frame = CGRectMake(120, 450, 140, 40);
myButton.buttonName = @"宋江";
myButton.backgroundColor = [UIColor blueColor];
[self.window addSubview:myButton];
[myButton setTitle:@"及时雨" forState:UIControlStateNormal];

return YES;
}

- (void)changeValue:(UITextField *)textField
{
self.label.textAlignment = NSTextAlignmentCenter;
if (textField.text.length >= 5) {
self.label.text = @"密码长度可使用";
} else {
self.label.text = @"密码长度过短";
}
NSLog(@"%@", textField.text);
}

- (void)knock:(UIButton *)button
{
//    UIButton *but = (UIButton *)[_window viewWithTag:1001];
if (self.isSelected) {
[button setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];
//        _textField.secureTextEntry = NO;
} else {
[button setImage:[UIImage imageNamed:@"check.png"] forState:UIControlStateNormal];
//        _textField.secureTextEntry = YES;
}
self.isSelected = !self.isSelected;
self.textField.secureTextEntry = !self.textField.secureTextEntry;
}

- (void)click:(UIButton *)button
{
// 先找到textField,然后再找到里面对应的内容
//    UITextField *textField = (UITextField *)[_window viewWithTag:1000];
NSLog(@"%@", self.textField.text);
}

- (void)applicationWillResignActive:(UIApplication *)application {
NSLog(@"%s %d",__FUNCTION__,__LINE__);
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
NSLog(@"%s %d",__FUNCTION__,__LINE__);
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
NSLog(@"%s %d",__FUNCTION__,__LINE__);
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
NSLog(@"%s %d",__FUNCTION__,__LINE__);  // 现在的程序只有这条协议方法打印出133
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

- (void)applicationWillTerminate:(UIApplication *)application {
NSLog(@"%s %d",__FUNCTION__,__LINE__);
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}

@end

#import <UIKit/UIKit.h>

@interface MyButton : UIButton

@property(nonatomic, copy)NSString *buttonName;

@end