摘要：
字典或者数组转化为nsstring NSArray *arr = [NSArray arrayWithObject:@"1"]; NSString *str = [arr JSONString]; //数组或者字典转化为json串 NSArray *arr1 = [str objectFromJSO 阅读全文
摘要：
textField.placeholder = @"username is in here!"; [textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"]; [textField setValu 阅读全文