IOS基础控件--UIImageView、UITextField

UIImageView:
1 - (void)viewDidLoad {
    [super viewDidLoad];
    
    UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(SCREENWIDTH / 2 - 46, 66, 92, 84)];
    imgView.image = [UIImage imageNamed:@"logo"];
    [self.view addSubview:imgView];
    
}

UITextField:

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width / 2 - 100, [UIScreen mainScreen].bounds.size.height / 2 - 20, 200, 40)];
    
    textField.placeholder = @"请输入用户名";
    
    textField.textAlignment = NSTextAlignmentCenter;//居中
    //Image路径
    NSString *path = [[NSBundle mainBundle] pathForResource:@"登录" ofType:@"png"];
    //文本域添加背景Image
    textField.background = [UIImage imageWithContentsOfFile:path];
    
    [self.view addSubview:textField];
    
}

UITextFieldDelegate 协议

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width / 2 - 100, [UIScreen mainScreen].bounds.size.height - 100, 200, 40)];
    
    textField.placeholder = @"请输入用户名";
    
    textField.textAlignment = NSTextAlignmentCenter;//居中
//    //Image路径
//    NSString *path = [[NSBundle mainBundle] pathForResource:@"登录" ofType:@"png"];
//    //文本域添加背景Image
//    textField.background = [UIImage imageWithContentsOfFile:path];
    
    [self.view addSubview:textField];
    
    textField.delegate = self;
    
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField//开始编辑，随着整体往上移动
{
    [UIView animateWithDuration:0.3 animations:^{self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y - 220, self.view.frame.size.width, self.view.frame.size.height);}];
    
    return YES;
}

//- (void)textFieldDidBeginEditing:(UITextField *)textField
//{
//    
//}

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{

}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSLog(@"%@", string);//每输入一个字符就打印一个，取出输入字符
    
    return YES;
}
- (BOOL)textFieldShouldClear:(UITextField *)textField
{
    
    
    return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
//    NSString *str = textField.text;
//    NSLog(@"%@", str);//获取输入字符串
    [textField resignFirstResponder];//return键盘收缩
    [UIView animateWithDuration:0.1 animations:^{self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y + 220, self.view.frame.size.width, self.view.frame.size.height);}];//随着键盘收缩，整体往下移动
    
    return YES;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

 UITextViewDelegate协议

- (void)viewDidLoad 
{
    [super viewDidLoad];
    UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(20, 30, [UIScreen mainScreen].bounds.size.width - 40, [UIScreen mainScreen].bounds.size.height - 300)];
    textView.text = @"虽然autoresizing已经过时，但我们还是有必要了解一下的。autoResizing是苹果早期的屏幕适配的解决办法，iOS6之前完全可以胜任，因为苹果手机只有3.5寸的屏幕，在加上手机app很少支持横屏，所以iOS开发者基本不用怎么适配布局，所";
    textView.font = [UIFont systemFontOfSize:20];
//    textView.userInteractionEnabled = NO;//禁止用户移动，不常用
    textView.textColor = [UIColor redColor];
    
    [self.view addSubview:textView];
//    textView.delegate = self;//执行<UITextViewDelegate>协议代理方法
    
}